Do Big Five Traits Change with Age? Here's the Data

Your personality isn't fixed. Big Five traits shift in measurable, predictable directions as you age - and the changes follow a remarkably consistent pattern across decades of research. Conscientiousness and agreeableness climb steadily. Neuroticism declines. Extraversion dips slightly. These shifts aren't dramatic, but they're real enough to reshape how you work, relate to others, and approach life.

The catch: understanding how traits change requires answering two different questions at once. Both are true, and they explain why personality feels both fixed and fluid.

Two questions, two answers

The confusion around personality change stems from conflating two separate phenomena. We need to distinguish between them to make sense of the data.

Mean-level change

The average person's trait scores shift with age. This is mean-level change. When we say "conscientiousness rises with age," we mean the average 45-year-old scores higher on conscientiousness than the average 25-year-old. The population-level average moves.

This is the easiest pattern to observe and the most robust finding in personality psychology.

Rank-order stability

Your position relative to your peers tends to stay stable. If you ranked in the top quartile for extraversion at age 20, you're likely still in the top quartile at age 50 - even if your absolute score has drifted down slightly.

Rank-order stability is high and increases with age. Your relative personality fingerprint hardens over time.

Both are true at once

This confuses people. You can become measurably more conscientious than you were at 25 and still be less conscientious than most of your peers. Your trait scores rise (mean-level change) while your position in the distribution stays roughly the same (rank-order stability).

You're changing. You're also staying the same. Both statements are accurate because they describe different phenomena.

How each trait changes with age

Research consistently shows directional shifts for all five factors. The magnitudes vary, and individual variation is substantial - but the overall patterns are clear.

Conscientiousness

Conscientiousness is the workhorse trait, and it rises more steeply than any other factor. Growth accelerates through the 20s and 30s, peaks around the 40s and early 50s, and may dip slightly in late old age (possibly reflecting cognitive or physical decline).

The increase is largest during the transition into stable work and family roles. Young adults who move into demanding jobs or parenting responsibilities show sharper conscientiousness gains than their peers who remain in unstructured environments.

Agreeableness

Agreeableness climbs steadily across the lifespan. The rise is gentler than conscientiousness but consistent. Peak agreeableness occurs in later adulthood, and the trajectory suggests that life experience - navigating relationships, resolving conflicts, managing interdependence - shapes this trait over decades.

Agreeableness may be the most malleable trait, most directly shaped by the social roles and relationships we inhabit.

Neuroticism

Neuroticism is highest in adolescence and early adulthood, peaks in the late teens and early 20s, and declines gradually through the rest of adulthood. The decline continues modestly into old age.

This pattern is robust across cultures. Young adults are more prone to anxiety, sadness, irritability, and self-doubt. By midlife, emotional reactivity moderates. The decline likely reflects both biological maturation and accumulated experience managing emotions.

Extraversion

Extraversion declines slightly across adulthood, but the effect is small and warrants nuance. At the facet level, warmth and friendliness stay stable; excitement-seeking and activity level decline. You may be just as socially warm at 55 as at 25, but less inclined toward high-stimulation environments or frequent social outings.

The decline is steepest after age 60 and may reflect changes in energy, opportunity, and social circles rather than a fundamental shift in social orientation.

Openness

Openness to experience rises through adolescence and early adulthood, then plateaus around age 30. After age 60, most longitudinal studies show modest declines - though the magnitude is small, and individual variation is high.

The early-life rise reflects cognitive development and broadening exposure. The later-life plateau or decline may reflect cognitive slowing or reduced novelty-seeking.

The maturity principle

Roberts, Walton, and Viechtbauer's 2006 meta-analysis of 92 longitudinal studies identified a unifying pattern they called the "maturity principle." It's simple: most adults become more socially mature with age.

Maturity, in this technical sense, means higher conscientiousness, higher agreeableness, and lower neuroticism. These traits facilitate work, long-term relationships, parenting, and cooperation. The pattern suggests that personality shifts in directions that make adult social functioning easier.

The mechanism remains partially debated. Does personality change because of social roles - work demands, marriage responsibilities, parenting pressures - that gradually reshape how we think and behave? Or does biological aging drive the shifts? Likely both. Young adults entering consistent work roles show sharper conscientiousness gains than their peers in unstable situations. But even adults whose life circumstances don't change much show some mean-level movement, suggesting intrinsic aging processes contribute too.

Important caveat: not everyone follows the maturity trajectory. A meaningful minority remain high in neuroticism or show flat or even declining conscientiousness across adulthood. Individual variation is substantial, and group averages obscure it.

Rank-order stability

The Roberts and DelVecchio (2000) meta-analysis examined rank-order stability - how consistent your relative position is across time. Their key finding: stability correlations hover around .55 for the age range 20-30 (meaning you're moderately likely to rank similarly to peers at both time points), rising to around .75 by age 50-60 (very likely to maintain your relative position).

Translation: early adulthood is the most fluid period for personality. A lot of people shift relative position. By midlife, your rank-order position has largely settled. Late life is the most stable period.

This doesn't mean personality can't shift at 50. It means that if you're lower in conscientiousness than your peers at age 50, you'll probably still be lower at 60 - even though both your score and the average may have risen.

Life events and trait change

Mean-level shifts occur steadily with age. But specific life transitions can accelerate personality change. Major events - work, relationships, loss - produce measurable short-term shifts that sometimes persist.

Entering work

First job transitions consistently produce rises in conscientiousness and emotional stability (lower neuroticism). The effect has replicated across multiple cohorts and longitudinal studies. Work structure shapes trait expression directly and rapidly.

Marriage

Marriage is associated with modest rises in conscientiousness and agreeableness and small drops in extraversion (less frequent socializing, more household-focused time). The effects are modest and vary by couple and context.

Parenthood

Parenthood correlates with increases in both agreeableness and conscientiousness, reflecting the caregiving demands of raising a child. Extraversion often drops as time and energy reallocate toward parenting. Some new parents experience temporary increases in neuroticism, likely stress-related, though the effect is inconsistent and often transient.

Divorce or loss

Relationship dissolution associates with small increases in neuroticism and, in some studies, decreases in agreeableness. The effects are typically modest and often rebound over 1-2 years.

Retirement

Asselmann and Specht (2021) found a pattern they termed personality "relaxation" around retirement: slight decreases in conscientiousness and extraversion as adults transition out of structured work roles. The effect is small but consistent.

Major trauma

Serious trauma (combat, violence, disaster) can produce lasting trait shifts, most notably increased neuroticism. The changes are often persistent and substantial.

Interventions that shift traits

Personality change isn't restricted to natural aging and life events. Intentional interventions work too.

Cognitive-behavioral therapy

Roberts et al. (2017) conducted a meta-analysis of 207 studies examining personality change via intervention. CBT produced measurable shifts in all five traits, with the largest effects on neuroticism. The reductions in anxiety and depression translate to lower neuroticism scores, and the effect sizes are moderate and durable across follow-up assessments.

Mindfulness-based interventions

Mindfulness training produces modest reductions in neuroticism and increases in agreeableness and openness. The effects are smaller than CBT but real and replicated.

Volitional change

Hudson and Fraley (2015) tested whether people could deliberately shift their own trait scores. Participants assigned to practice target behaviors (e.g., social engagement for extraversion, organization for conscientiousness) for 12-16 weeks showed measurable gains. The interventions worked best when the behavioral targets fell within someone's existing trait range - asking an introvert to become highly extraverted was less effective than asking them to become moderately more extraverted.

Medication

SSRIs reduce neuroticism scores beyond their direct symptom-specific effects on depression and anxiety. Tang et al. (2009) found that antidepressants produce personality shifts independent of symptom improvement, suggesting a direct biological pathway.

Major life commitments

New jobs, serious relationships, formal training programs, and other structured commitments indirectly shift traits by reshaping daily behavior and environmental demands. The change accumulates through repeated behavior, not through any single intervention event.

Individual variation

The patterns we've described are robust population averages. They conceal enormous individual variation.

Some people become dramatically more conscientious across adulthood. Others remain consistently unstructured. Some show sharp neuroticism declines in their 20s and 30s; others remain high-strung throughout. A few buck the trends entirely.

Who changes most? People who experience major life transitions, participate in therapy, disrupt their established routines, or enter high-demand environments. Who stays stable? Those in consistent environments with stable roles and relationships, particularly in later adulthood.

The frustrating part: you can't predict your own trajectory from population averages alone. The average person becomes more conscientious, but that tells you nothing about whether you specifically will. Life events predict change, but the effect sizes are modest - many people experience major transitions without detectable personality shifts.

Practical implications

If you're 25 and feel stuck with your personality: you're probably not. Most people show substantial trait shifts by age 45, and the majority shift in adaptive directions. You'll likely become more conscientious, more agreeable, and less neurotic - not because of effort, but because of aging and the roles you inhabit.

If you want to shift a specific trait faster than time alone would accomplish: structured practice works. Cognitive-behavioral therapy produces real change. Deliberate behavioral practice - forced social engagement for extraversion, organization and planning systems for conscientiousness - moves the needle over weeks and months.

If you're frustrated with your trait profile and you're older: change is slower but still possible. Therapy, medication, mindfulness, and major life commitments have all shown effects even in midlife and later.

Retake our Big Five test every 3-5 years. The shifts are gradual, so annual retesting won't show much. But across a half-decade, you'll likely see measurable movement, particularly in conscientiousness, agreeableness, and neuroticism.

For more on the five factors and what they measure, read our full guide to the Big Five personality traits.

Key takeaways

• Conscientiousness and agreeableness rise steadily with age; neuroticism declines; extraversion and openness show smaller changes.
• Most adults become more socially mature with age - a pattern called the maturity principle.
• Rank-order stability increases with age. Your relative position becomes more fixed.
• Life events produce measurable trait changes, especially work transitions, marriage, and parenthood.
• Therapy, mindfulness, medication, and deliberate behavioral practice accelerate personality change beyond natural aging.
• Individual variation is substantial. Group averages don't predict individual trajectories.
• Personality is not fixed in adulthood, but change becomes slower and more stable with age.

Frequently asked questions

Do Big Five traits change with age?

Yes. Mean-level change is consistent and robust across decades of research. Conscientiousness and agreeableness rise; neuroticism declines. The changes are gradual but measurable. Your rank-order position relative to peers also becomes more stable with age, meaning you're more likely to occupy the same relative position in the distribution.

Which Big Five trait changes most with age?

Conscientiousness shows the largest mean-level change, particularly during the transition into stable work and family roles. It rises steadily from the early 20s through the 40s and 50s. Agreeableness also rises substantially. Neuroticism declines significantly. Extraversion and openness show smaller changes.

Does neuroticism decrease as we get older?

Yes, consistently. Neuroticism (anxiety, sadness, irritability, vulnerability) is highest in late adolescence and early adulthood and declines gradually through midlife and into old age. The decline is one of the most robust age-related personality patterns.

Can conscientiousness increase over time?

Yes, both naturally with age and through deliberate effort. Most people experience conscientiousness gains in their 20s, 30s, and 40s, particularly when entering demanding work or caregiving roles. Deliberate practice, structured behavioral training, and major life commitments also elevate conscientiousness.

Are you stuck with your Big Five personality in adulthood?

No. While personality becomes more stable with age, change continues throughout adulthood. Major life events, therapy, mindfulness practice, and volitional behavioral change all produce measurable shifts. Early adulthood is the most fluid period, but meaningful change is possible at any age.

What is the maturity principle?

The maturity principle is the observation that most adults become more socially mature with age - meaning higher conscientiousness, higher agreeableness, and lower neuroticism. These shifts reflect both biological aging and the influence of work, relationships, and caregiving roles that reward social maturity.

Do life events change personality?

Yes, major transitions predict personality shifts. Entering work, marriage, parenthood, retirement, and major trauma all correlate with measurable trait changes. The effect sizes are modest but consistent across multiple studies.

Does marriage change personality?

Marriage correlates with modest increases in conscientiousness and agreeableness and slight decreases in extraversion. The effects are small and variable across couples. Life circumstances (joint household, shared responsibilities) likely shape the shifts more than the act of marriage itself.

Does therapy change personality?

Yes. Cognitive-behavioral therapy produces the most evidence-based personality change, especially reductions in neuroticism. Mindfulness and other structured interventions also show effects. Change develops gradually but is durable beyond the intervention period.

At what age does personality stabilize?

Rank-order stability increases continuously from late adolescence into old age. By age 50-60, your relative position is highly stable (rank-order correlations around .75). But mean-level change (your absolute trait scores) continues across the lifespan, albeit more slowly in later life.

Can you change your personality on purpose?

Yes, though with caveats. Deliberate behavioral practice works best for shifts within your existing trait range. Asking an introvert to practice moderate social engagement is effective; asking them to become highly extraverted may fail. Therapy, structured behavioral training, and medication all produce intentional personality shifts.

Take our Big Five test today. Retake in 3-5 years. Watch your profile shift on TheBig5.

Sources

Roberts, B. W., Walton, K. E., & Viechtbauer, W. (2006). Patterns of mean-level change in personality traits across the life course: A meta-analysis of longitudinal studies. Psychological Bulletin, 132(1), 1-25.

Roberts, B. W., & DelVecchio, W. F. (2000). The rank-order consistency of personality traits from childhood to old age: A quantitative review of longitudinal studies. Psychological Bulletin, 126(1), 3-25.

Roberts, B. W., Lodi-Smith, J., Robins, R. W., & Seery, M. D. (2017). Intervention programs for personality change. In Personality processes and individual differences. American Psychological Association.

Asselmann, E., & Specht, J. (2021). Personality change through life transitions: Insights from a longitudinal study. Journal of Personality and Social Psychology, 120(5), 1114-1135.

Specht, J., Egloff, B., & Schmukle, S. C. (2011). Stability and change of personality across the life course: The impact of age and major life events. Journal of Personality and Social Psychology, 101(4), 862-882.