personality change

Intentional Personality Change Can You Rewire Your Traits on Purpose

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Can Your Personality Change Over Time? What Science Says About Trait Stability and Growth

Yes, your personality can change over time — but not in the dramatic, overnight transformation that popular psychology often promises. Decades of longitudinal research show that personality traits, the characteristic patterns of thinking, feeling, and behaving that define who you are, display both meaningful stability and gradual change across the lifespan. A 2026 meta-analysis by Haehner and colleagues, published in Psychological Bulletin and drawing on 362 longitudinal studies with nearly 400,000 participants, confirmed that personality trait variance remains remarkably stable across age groups — yet mean-level shifts in specific traits continue well into your sixties and seventies. Research by Brent Roberts at the University of Illinois found that personality traits typically show correlation coefficients of around 0.6 to 0.7 over periods of several years, meaning roughly 50 to 60 percent of personality variance stays stable while a substantial portion remains open to change. In other words, your core personality is neither set in stone nor infinitely malleable — it is a stable foundation that gradually evolves as you move through life.

The most thoroughly validated framework for tracking these changes is the Big Five personality model, also called the Five Factor Model or OCEAN: Openness to Experience, Conscientiousness, Extraversion, Agreeableness, and Neuroticism. Each dimension represents a spectrum rather than a category, which makes the Big Five far better suited for measuring gradual change than type-based systems like the Myers-Briggs Type Indicator (MBTI), which sorts people into one of 16 personality types. If you want to see where you currently stand on these dimensions, tools like personalitree.com offer free Big Five and 16-type personality tests that take about ten minutes — a practical baseline you can revisit years later to observe whether and how your profile has shifted.

What Does “Personality Stability” Actually Mean?

Personality stability refers to how consistently your trait levels hold over time, but researchers distinguish between two very different kinds of stability that often pull in opposite directions. Rank-order stability, also called differential continuity, measures whether you maintain your relative position compared to other people — if you are more conscientious than average at 25, are you still more conscientious than average at 45? Mean-level change, by contrast, measures whether the average scores for an entire group rise or fall over time — whether everyone becomes more agreeable as they age, for instance.

A group can show strong rank-order stability — people keep their relative positions — while simultaneously showing significant mean-level change — everyone drifts upward on a trait together. Understanding this distinction matters because it explains why you can feel like a completely different person at 40 than at 20, even though you still rank similarly compared to your peers. Both types of stability are relevant when asking whether personality can change, and both have been studied extensively through longitudinal designs that track the same individuals over years or decades.

The “Plaster Hypothesis”: Why Scientists Once Thought Personality Was Fixed

In the 1990s, researchers Paul Costa and Robert McCrae proposed what became known as the “plaster hypothesis” — the idea that personality traits crystallize by around age 30 and change very little afterward. Their data from the Baltimore Longitudinal Study of Aging showed high test-retest correlations for Big Five traits across decades of adulthood, suggesting remarkable stability.

A 2010 study by Antonio Terracciano, McCrae, and Costa themselves, published in the Journal of Research in Personality, added important nuance. Using 684 participants assessed three times over several years, they found that intra-individual personality stability increases up to age 30 and then plateaus — but a plateau is not a flatline. They found that 92 percent of participants had stability coefficients above 0.50, meaning most people retained much of their personality, but the remaining variance still allowed for meaningful individual change. A subsequent meta-analysis by Roberts, Walton, and Viechtbauer (2006), published in Psychological Bulletin, analyzed 92 longitudinal studies and demonstrated systematic mean-level changes well beyond age 30, directly challenging the idea that personality hardens permanently in early adulthood.

How Each Big Five Trait Changes With Age

Research consistently identifies predictable patterns of mean-level personality change across adulthood, a phenomenon sometimes called the “maturity principle” — the tendency for people to become more socially adapted over time. The specific direction and magnitude of change varies by trait:

  • Conscientiousness — the tendency toward self-discipline, organization, and goal-directed behavior — rises steadily, with the steepest gains between ages 20 and 40, then continues more gradually into the sixties.
  • Agreeableness — warmth, cooperation, and concern for others — grows particularly in middle age and beyond, as people invest in deeper relationships and take on mentoring or caregiving roles.
  • Neuroticism — the tendency toward anxiety, irritability, and emotional volatility — generally declines, meaning people become more emotionally stable as they mature. The sharpest drops occur during young adulthood.
  • Extraversion — sociability and assertiveness — shows a mixed pattern: social dominance tends to increase while excitement-seeking tends to decrease with age.
  • Openness to Experience — curiosity and receptiveness to new ideas — remains relatively stable through most of adulthood but may decline slightly in very late life.

The 2026 meta-analysis by Haehner and colleagues also found that neuroticism variance increases during late childhood and early adolescence (ages 5 to 14), suggesting that the teenage years represent a period of heightened emotional differentiation before gradual stabilization begins. They also found that extraversion variance decreases during middle and late adulthood (ages 45 to 80), suggesting people become more similar to one another on this dimension as they get older. These findings mean that personality change is not uniform across traits or across life stages — some dimensions shift more than others, and the timing of change varies considerably.

Can You Intentionally Change Your Personality?

Research suggests that intentional, self-directed personality change is possible, though it requires sustained effort rather than wishful thinking. Several Big Five traits — including extraversion, conscientiousness, and agreeableness — have been shown to respond to volitional change interventions. Even relatively short programs, such as a two-week smartphone-based intervention targeting a specific facet like self-discipline, can produce measurable shifts, at least in the short term.

Therapy also drives personality change. A common question people ask is whether counseling can actually shift their personality. Evidence indicates that psychotherapy, particularly cognitive behavioral therapy, can reduce neuroticism over months of treatment, and these changes tend to be durable rather than temporary. The key finding across studies is that consistency matters more than intensity — small, regular behavioral changes accumulate into trait-level shifts over time, while sporadic intense efforts rarely produce lasting change. This aligns with what personality researchers describe as the cumulative continuity principle: repeated experiences and behaviors gradually reshape the habitual patterns that define your trait profile.

What Life Events Do to Your Personality

Major life transitions — marriage, becoming a parent, career changes, trauma, or retirement — can catalyze measurable personality shifts. Research published by Bleidorn, Hopwood, and Lucas in the Journal of Personality (2018) found that first long-term relationships are associated with decreases in neuroticism, while marriage can initially lower agreeableness before it stabilizes over time. Taking on a leadership role at work can gradually increase assertiveness, even in someone who starts out shy. These shifts are not random — they reflect the ways that sustained social roles reshape habitual patterns of thinking and behaving, a process consistent with the concept of character traits as malleable dispositions shaped by ongoing experience.

What This Means for Personality Testing

If personality can change, what is the point of taking a personality test? A personality assessment captures a snapshot of your current trait levels, which remains genuinely useful for self-awareness, career planning, and understanding your relational tendencies at this moment in time. It does not lock you into a fixed identity. Retaking a Big Five test every few years can reveal whether you are following the typical developmental trajectory — rising conscientiousness, declining neuroticism — or charting your own course shaped by unique experiences. Websites like personalitree.com make this kind of longitudinal self-tracking accessible, offering both the Five Factor Model and 16-type frameworks in a format that takes about ten minutes to complete.

It is worth noting that the popular MBTI — which categorizes people into one of 16 personality types like INTJ or ENFP — is less well-suited for tracking change because its binary categories (introvert versus extrovert, thinking versus feeling) do not capture gradual shifts. A person who moves from the 40th to the 60th percentile on extraversion has changed meaningfully, but the MBTI would still label them an introvert. The Big Five’s dimensional approach provides far more sensitivity to the kinds of gradual, cumulative changes that research consistently documents across the lifespan.

Frequently Asked Questions

Can your personality type change over time?

Yes. While your broad personality structure shows considerable stability — correlation coefficients of 0.6 to 0.7 over several years — research consistently documents mean-level shifts in Big Five traits across the lifespan. Conscientiousness and Agreeableness tend to rise, Neuroticism tends to fall, and these changes continue well beyond age 30. Type-based labels like MBTI categories are less sensitive to these gradual shifts because they use binary cutoffs rather than continuous dimensions.

At what age does personality become stable?

Research by Terracciano, McCrae, and Costa (2010) found that intra-individual personality stability increases up to about age 30 and then plateaus. However, a plateau means the rate of change slows — it does not mean change stops entirely. Meta-analyses show that mean-level personality change continues through middle age and into the sixties and seventies, with traits like Conscientiousness still rising gradually even in older adults.

Can therapy change your personality traits?

Evidence suggests yes. Psychotherapy, particularly cognitive behavioral therapy, has been shown to reduce neuroticism over months of treatment. The personality changes associated with therapy tend to be durable rather than temporary, and they reflect genuine shifts in how people habitually process emotions and respond to stress, not just symptom management. Consistency in therapeutic practice appears to be the strongest predictor of lasting trait change.

How much of personality is genetic versus shaped by experience?

Twin studies and behavioral genetics research estimate that approximately 40 to 60 percent of personality variation is attributable to genetic factors. The remaining variation reflects environmental influences, life experiences, social roles, and intentional change efforts. This means genetics set a range rather than a fixed point — your experiences and choices determine where within that range you ultimately land.

Should I retake a personality test if I took one years ago?

Retaking a personality test after several years can be informative, especially if you use a dimensional framework like the Big Five rather than a categorical system. You may find that your trait levels have shifted in ways that align with typical developmental patterns — higher Conscientiousness, lower Neuroticism — or you may discover unique changes driven by your own life experiences. Either way, comparing results over time offers a richer picture of personal growth and self-awareness than a single snapshot ever could.

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Are You Stuck With Your Personality Type? The Research Says No

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The Question Nobody Asks Until They Take a Second Personality Test

Most people who take a personality test treat the results as a fixed label. You score high in Openness, moderate in Extraversion, and low in Neuroticism — and you file that away as a permanent description of who you are. But then something happens. A few years pass, maybe a decade, and you take the test again. The scores shift. Not dramatically, but noticeably. Openness drops a few points. Conscientiousness climbs. You start to wonder: was the first test wrong, or did you actually change?

Personality psychology has been wrestling with this question for nearly a century. The answer that has emerged from decades of longitudinal research is neither as simple as “people never change” nor as optimistic as “you can become anyone.” The truth sits in between — and understanding it has practical implications for how you think about personal growth, therapy, relationships, and the trajectory of your life.

The Evidence for Stability: Why Personality Feels Permanent

There is a reason personality tests feel revealing rather than random. Research consistently shows that personality traits are remarkably stable over time, especially in adulthood. Large-scale longitudinal studies — including the Dunedin Study in New Zealand, which tracked over 1,000 people from birth to midlife, and the Baltimore Longitudinal Study of Aging, spanning decades — have found that rank-order stability for Big Five traits ranges from 0.70 to 0.85 over ten-year periods in adults.

What does that number mean in practice? If you are the most conscientious person in your friend group at age 30, there is a very good chance you will still rank among the most conscientious at age 50. Your absolute score might shift, but your position relative to others tends to hold. This stability is one of the reasons personality researchers consider the Big Five a robust framework — the traits are not fleeting moods or situational states. They reflect enduring patterns in how a person thinks, feels, and behaves across contexts.

The biological foundations of personality contribute to this stability. Behavioral genetics research, including genome-wide association studies, consistently estimates that 40 to 60 percent of the variance in Big Five traits is heritable. Twin studies, adoption studies, and molecular genetics all converge on the conclusion that your genetic makeup sets a range for each trait — a baseline that predisposes you toward certain patterns. This is why personality can feel so deeply ingrained. To some extent, it is built into your biology.

The Maturity Principle: The Predictable Arc of Personality Change

Here is where it gets interesting. Despite the strong stability findings, personality does change — and the changes follow a surprisingly consistent pattern across populations. Personality psychologists Robert Roberts and Daniel Mroczek have documented what they call the “maturity principle”: as people move through adulthood, they tend to become more emotionally stable, more agreeable, and more conscientious, while Extraversion and Openness tend to decline modestly.

The pattern looks roughly like this:

  • Neuroticism decreases — people generally become less emotionally reactive and less prone to anxiety and negative mood swings as they age, with the steepest declines occurring between age 20 and 40.
  • Agreeableness increases — most adults become more cooperative, trusting, and warm over time, particularly during their 30s and 40s.
  • Conscientiousness increases — responsibility, organization, and self-discipline tend to rise through midlife, plateauing around age 50 to 60.
  • Extraversion decreases slightly — social energy and sensation-seeking tend to decline modestly, though the change is smaller than for the other three traits.
  • Openness to Experience decreases — receptivity to novelty and unconventional ideas tends to decline gradually, especially after age 60.

These are population averages, not individual mandates. Some people become less conscientious with age. Some become more extraverted. But the aggregate trend is reliable enough to show up in studies across cultures, including research from the United States, Germany, Japan, and the Netherlands. The maturity principle is one of the most robust findings in personality development research.

What Drives These Changes

The maturity principle raises an obvious question: why does personality follow this arc? Researchers point to several interacting mechanisms.

Biological maturation. The prefrontal cortex, which governs impulse control, planning, and emotional regulation, continues developing well into a person’s mid-20s. As brain maturation progresses, the neurological capacity for conscientious behavior and emotional stability literally expands. Hormonal changes across the lifespan — from the testosterone and cortisol shifts of early adulthood to the slower endocrine changes of later life — also influence trait expression.

Role investment. The most widely supported explanation for personality change is that people invest in social roles that reward certain traits. When you take on a job that requires discipline, a marriage that demands compromise, or a parenting role that necessitates patience, you practice those behaviors repeatedly. Over years, the practice reshapes your habitual responses. A disorganized 22-year-old who becomes a project manager at 32 is not faking their newfound organization — they have built genuine conscientiousness through sustained role demands.

Life experiences. Major events — career changes, relocation, bereavement, serious illness, becoming a parent — can catalyze personality shifts. Research on post-traumatic growth has found that some people who experience significant adversity report lasting increases in Agreeableness and appreciation for life, though the effects vary considerably by individual and circumstance. Positive experiences matter too. Studies have found that people who enter satisfying romantic relationships show decreases in Neuroticism that persist over time, even after controlling for baseline differences.

Can You Change Your Personality on Purpose?

This is where the research gets particularly interesting — and directly relevant to anyone who has ever wanted to become more outgoing, less anxious, or more organized. A growing body of evidence suggests that intentional, volitional personality change is not only possible but achievable through sustained effort.

Pioneering work by Nathan Hudson and Christopher Fraley at the University of Illinois demonstrated that people who set specific goals to change a particular personality trait — and who followed up with behavioral strategies over a 16-week period — showed measurable changes in their Big Five scores compared to control groups. The changes were not enormous, but they were statistically significant and persisted at follow-up assessments.

The strategies that worked in these studies were surprisingly practical:

  • Goal setting and behavioral challenges. A person trying to increase Extraversion might commit to initiating one conversation with a stranger per day. Someone working on Conscientiousness might adopt a daily planning routine. The key was consistency — small, repeated behaviors that gradually reshaped habitual patterns.
  • Environmental restructuring. Changing your circumstances to support the trait you want to develop. Wanting to become more open to experience? Deliberately seeking out unfamiliar environments, reading outside your usual genres, spending time with people who challenge your assumptions.
  • Situational cue modification. Identifying the situations that trigger unwanted trait expressions and adjusting your exposure to them. A person trying to reduce Neuroticism-driven rumination might limit late-night social media scrolling, which research consistently links to mood destabilization.

The research does not suggest that personality is infinitely malleable. A deeply introverted person is unlikely to transform into a natural social butterfly through willpower alone. But moderate, meaningful shifts — moving from the low end to the middle of a trait distribution, for instance — appear to be within reach for people who commit to sustained behavioral change.

Hudson’s subsequent research has also found that some traits are easier to change intentionally than others. Emotional Stability (the low-Neuroticism end of the spectrum) and Conscientiousness tend to respond well to intentional intervention, while Extraversion and Agreeableness show more resistance. Openness, perhaps unsurprisingly, sits in the middle — people can become more open through deliberate exposure to new experiences, but the changes tend to be modest.

The Role of Therapy and Intervention

Clinical psychology provides another window into personality change. A meta-analysis published in Psychological Bulletin examining data from over 144 studies found that psychotherapy can produce meaningful changes in personality traits, particularly Neuroticism and Extraversion. Patients entering therapy for depression or anxiety often show reductions in Neuroticism that exceed the typical annual rate of natural change. The effects are not limited to clinical populations — even people in therapy for personal growth rather than diagnosable conditions show personality shifts.

Cognitive Behavioral Therapy appears especially effective at reducing Neuroticism, likely because it directly targets the negative thought patterns and catastrophic thinking that define the high-Neuroticism profile. Mindfulness-based interventions have shown promise for both Neuroticism reduction and increases in self-reported Conscientiousness, possibly through the attentional discipline that regular mindfulness practice requires.

The practical implication is that personality change is not limited to the slow, natural drift of the maturity principle. Focused psychological intervention can accelerate shifts that might otherwise take years to occur — or shift traits in directions that natural maturation would not produce on its own.

What This Means for Your Personality Test Results

If you take a well-validated Big Five personality test today, your results provide a reasonably accurate snapshot of where you currently stand on each trait dimension. But those scores are not permanent. Your Neuroticism score will likely be lower in ten years. Your Conscientiousness will probably be higher. Your Openness may decline slightly. And if you deliberately work on a particular trait — through therapy, habit change, or environmental restructuring — you may accelerate or redirect those changes.

The most useful way to think about personality test results is not as a permanent label but as a baseline measurement. It tells you where you are starting from, which is valuable information for anyone interested in personal growth. If you want to explore your current profile, tools like personalitree.com offer both Big Five and 16-type personality assessments that provide that starting point — useful not as a verdict on your character, but as data for the changes you might want to make.

The Balanced View: Neither Fixed Nor Fluid

The evidence paints a picture that avoids both extremes. Your personality is not a cage — research on intentional change, therapy, and life experiences demonstrates meaningful plasticity, particularly for Neuroticism and Conscientiousness. But your personality is also not a blank canvas — genetic predispositions, early-life experiences, and decades of habit create inertia that makes radical transformation unlikely.

Perhaps the most useful framework is to think of personality as a landscape with defined boundaries but considerable interior space. You cannot turn a mountain into an ocean, but you can build roads, plant forests, and redirect rivers within the terrain you have. The research on personality change suggests that most people have more room to move within their landscape than they realize — and that the movement happens through the quiet accumulation of daily choices, not through dramatic self-reinvention.

Websites like personalitree.com can help you map that landscape by showing where you fall on the key personality dimensions. The map is not the territory, and the territory is not fixed. But knowing both gives you something more valuable than either alone: the ability to navigate on purpose.

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