Yes, personalities change over time, but the shift is gradual rather than dramatic. Most people become more emotionally stable, more agreeable, and more conscientious as they move from adolescence into middle age. At the same time, your basic personality profile relative to other people stays fairly consistent. If you’re more outgoing than most of your peers at 25, you’ll likely still be more outgoing than most of them at 55. The real story is that both stability and change are happening simultaneously, just on different tracks.
How Personality Changes With Age
The general direction of personality change across adulthood follows what psychologists call the “maturity principle.” From the late teens through middle age, people tend to gain self-discipline, become warmer and more cooperative, and grow less emotionally reactive. These aren’t small, contested findings. A 2022 meta-analysis synthesizing data from hundreds of longitudinal studies and over 242,000 participants confirmed that personality changes in the direction of greater maturity as people age.
Emotional stability shows the most consistent and substantial increase across the lifespan. The tendency toward anxiety, moodiness, and emotional volatility gradually decreases from young adulthood through roughly age 80. After 80, there’s a slight uptick, with projected levels at age 100 returning to about where they were in a person’s seventies.
Not every trait follows the maturity pattern neatly. Research tracking personality facets from age 30 to 70 found that while most traits developed adaptively, a few moved in the opposite direction. Energy level, emotional openness, and social confidence all declined significantly across adulthood. So “maturing” doesn’t mean everything gets better. Some of the vitality and emotional richness of youth genuinely fades.
How Much You Stay the Same
While average trait levels shift, your personality ranking relative to other people is surprisingly durable. Over two- to three-year windows, test-retest correlations for the major personality traits range from .49 to .62. Over longer spans of 20 to 50 years, those correlations drop to .31 to .45, meaning there’s real drift, but the core pattern persists. If you lined up 100 people by conscientiousness at age 30, their order at age 50 would be shuffled but recognizable.
This stability increases as you get older. Average stability correlations rise from .53 for people in their thirties to .59 for people in their fifties. Interestingly, a large 2022 meta-analysis found little evidence that stability keeps increasing after age 25, challenging an older idea that personality continues to “set like plaster” well into midlife. Instead, the plateau appears to arrive earlier than previously thought.
What Drives the Change
Genetics and environment play distinctly different roles in personality stability versus personality change. Twin studies that separated stable and changing components of personality found a clear pattern: genetic factors primarily influence your baseline trait levels and how stable those levels remain over time. Change, on the other hand, is driven largely by your unique life experiences. For emotional reactivity, non-shared environmental factors accounted for about 79% of the variance in how much the trait shifted over time. For self-control, that figure was about 50%.
This means the aspects of personality that change are mostly responding to what happens to you, not what you inherited.
Life Events That Shift Personality
Specific life transitions can alter the trajectory of personality development. Marriage, becoming a parent, retirement, and divorce have all been linked to measurable trait shifts. A large longitudinal study found that both dramatic role changes like divorce and smaller recurring experiences, such as a partner regularly doing something thoughtful, can redirect personality over time. The mechanism seems to involve adopting new social roles that require and reinforce different behaviors until those behaviors become habitual, eventually registering as trait-level change.
Why the Brain Allows It
The brain’s physical development provides the hardware for personality change, especially in the first few decades of life. The prefrontal cortex, the region responsible for impulse control, planning, and judgment, is among the last brain areas to fully mature. It develops in a back-to-front pattern, which is why teenagers and young adults can be simultaneously intelligent and impulsive. The insulating coating on nerve fibers that allows efficient communication between brain regions continues forming well into the twenties.
During adolescence, the brain’s excitatory signaling systems are largely in place while the inhibitory systems that put the brakes on impulsive behavior are still being built. This imbalance helps explain the risk-taking and emotional intensity of the teenage years, and why those traits naturally diminish as the brain finishes developing. The brain also retains plasticity throughout life, meaning it can rewire itself in response to new skills, environments, and repeated experiences, which is part of why personality remains changeable even in later decades.
Can You Change Your Personality on Purpose?
About 60% of people worldwide say they want to change at least some aspect of their personality. The question is whether wanting to change actually works.
A 2024 systematic review of 30 longitudinal studies covering over 7,700 participants found that simply wanting to change your personality produces only weak results on its own. But structured interventions designed to support personality change do work, with a small but meaningful average effect size. More encouraging, these changes didn’t fade after the intervention ended. Over follow-up periods of up to 12 months, the effects actually grew slightly larger, suggesting that the initial nudge set in motion a self-reinforcing process. The changes also showed up not just in people’s self-reports but in how others perceived them.
These interventions typically involve practicing new behaviors repeatedly in daily life, which aligns with the broader finding that personality change is driven by experience. You’re unlikely to wake up one day as a fundamentally different person through sheer willpower, but consistently acting in new ways can, over months, shift the traits that define how you typically think, feel, and behave.