Does Personality Change Over Time?

Personality is more stable than a mood and less fixed than a fingerprint. Big Five scores measured years apart from the same person are usually closer to each other than scores from two random strangers taken on the same day. That's the stable side. But they're rarely identical either: self-descriptions drift gradually across a lifetime, nudged by age, role, and circumstance. Both things are true at once, and neither is the more “correct” story about personality.

The useful distinction is between two different questions researchers ask about stability. One is whether your position relative to other people holds steady over time: rank-order stability. The other is whether the average person's score on a trait tends to drift in a particular direction as they age, often called the maturity principle. They're separate findings, and both matter for reading your own result honestly.

Rank-order stability asks a relative question: if you were more Conscientious than most of the people around you at twenty-five, are you still relatively more Conscientious than a comparable group at forty-five? The evidence points toward this kind of ordering holding up reasonably well across years, and more so as people move from adolescence into adulthood — people's standing relative to their peers doesn't reshuffle at random.

That's different from saying a score never moves. Someone's absolute number on a 0–100 scale can shift over a decade while their standing relative to peers barely changes, the same way a runner can get faster and still finish in the same spot in the pack if everyone around them also got a little faster. A Big Five score is a snapshot of one point inside that slower-moving picture, not a fixed reading.

Averaged across large groups, three of the five traits show a fairly consistent direction of drift across adulthood: Conscientiousness, Agreeableness, and Emotional Stability tend to edge upward with age — more follow-through, more warmth and cooperation, more steadiness under pressure — while Openness and Extraversion show smaller and less consistent movement. Personality researchers, including Brent Roberts and colleagues who study how personality develops across adulthood, have described this pattern as the maturity principle: people tend to grow into the traits associated with being a reliable, cooperative, even-keeled adult.

Two honest caveats belong right next to that finding. It's a pattern in averages, not a guarantee for any one person; plenty of individual paths move against the group trend, or barely move at all. And it isn't on a schedule: the shift isn't tied to a birthday, it plays out over years and tends to track sustained changes in circumstance (taking on responsibility for other people, settling into a role, the kind of repeated practice a demanding decade forces on someone) more than the simple passage of time.

Claims like these come from longitudinal studies: the same people, surveyed on the same trait questions years or even decades apart, so researchers can compare a person's self-description at one age against their own self-description later, not just against a different group of people at each age. That design is what separates the two questions above — whether people keep their relative ordering, and whether the group average drifts — from a guess based on a single snapshot.

It's also why the honest version of this finding stays modest. Long-running studies are harder to run than one-time surveys, participants drop out over the years, and different studies sampling different countries, age ranges, and generations don't always agree on the exact size of a shift, even when they broadly agree on its direction. The maturity principle describes a real, frequently replicated pattern in the direction traits tend to move, not a precise formula for how much any one person's score will change.

Nothing about this looks like a single event flipping a trait. A hard year, a big promotion, a move, a breakup — none of it rewrites someone's Big Five profile overnight, even when it feels transformative while it's happening. The honest picture is closer to sediment than to a light switch: small, repeated experiences accumulate over years into a self-description that has genuinely shifted, without any single week being the cause.

This runs against a familiar story: the single dramatic turning point that supposedly changed someone completely. Real turning points can matter, but what they usually launch is a new pattern of daily behavior: a new routine, a new set of responsibilities, a different set of people around you. It's the years of repeating that new pattern, more than the triggering event itself, that eventually shows up as a shifted self-description.

That's worth knowing before you retake a test. If your Emotional Stability score reads a little higher next year, or your Conscientiousness score a little different in five years, that isn't the test being unreliable; it's a snapshot doing exactly what a snapshot does when the thing it's measuring moves slowly underneath it.

None of this turns your current scores into a prediction about who you'll be later, and it isn't a reason to expect any one of your traits to rise or fall on schedule. What it does offer is a more honest frame for a result: five separate 0–100 scores, each a real description of your tendencies as you'd describe them today, sitting inside a life that keeps moving. A lower-range score on any trait right now describes where you are, not a limit on where you might land if you retake the test in a different season of life. The same goes in the other direction: a higher-range score today isn't a permanent ceiling on someone else's room to change either, and neither reading is a verdict on anyone's character.

If you haven't taken the test yet, that's the starting snapshot this whole conversation is about: 50 statements, about 7 minutes, five separate 0–100 scores with no overall number to average them into. Curious how these same tendencies show up in the work you choose? See The Big Five and Career Fit. Or take the free Big Five personality test now and start at the traits hub for the full picture of all five.