"That's just how I am" is one of the most common things people say about themselves. It is also only half true.
Personality research paints a more interesting picture. Your traits are real, fairly stable and partly inherited. But they are not frozen. Across adulthood, most people change in predictable directions, and there is growing evidence that you can nudge your own traits on purpose. Here is what the science actually supports.
First, what are we talking about?
When psychologists study personality change, they usually measure the Big Five: openness, conscientiousness, extraversion, agreeableness and neuroticism. Each is a continuous dimension, so "change" means moving along a scale, not flipping from one type to another.
If you need a refresher on what each trait captures, start with The Big Five personality traits, explained.
Stable, but not fixed
Two findings sit side by side in this research, and both are true.
Traits are fairly stable
If you rank a group of adults on extraversion today and again years later, the rankings tend to look broadly similar. The person who was the most outgoing in the room is still likely to be among the more outgoing. This rank-order stability tends to increase through young adulthood and stay fairly high through middle age.
Part of the reason is biological. Twin and family studies consistently find that Big Five traits are moderately heritable. Your genes do not write your personality, but they shape the starting point and the kinds of environments you are drawn to.
Traits also change gradually
At the same time, the average level of traits shifts as people age. Almost everyone becomes a somewhat different version of themselves over the decades, even if their position relative to their peers stays similar.
The maturity principle
The most consistent pattern of change has a name: the maturity principle. On average, as people move from adolescence into adulthood and middle age:
- Conscientiousness tends to rise. People become more organised, reliable and self-disciplined.
- Agreeableness tends to rise. People become warmer, more cooperative and more forgiving.
- Neuroticism tends to fall. People become calmer and more emotionally stable.
In other words, many people become more of the things that help them function well in adult roles like work, relationships and caregiving. The changes are usually gradual, often happening over years rather than months.
| Trait | Typical direction with age | What that tends to look like |
|---|---|---|
| Conscientiousness | Rises | More planning, follow-through and self-control |
| Agreeableness | Rises | More patience, empathy and cooperation |
| Neuroticism | Falls | Fewer mood swings, less reactivity to stress |
| Extraversion | Mixed | Some aspects stay steady while others, such as thrill-seeking, tend to soften |
| Openness | Mixed | Can rise in early adulthood and ease later in life |
These are averages. Plenty of individuals buck the trend, and your own path depends on your circumstances.
What drives personality change?
Life roles and experiences
A popular explanation is that the roles we step into shape us. Starting a demanding job, committing to a partner or raising a child all reward reliability, patience and emotional steadiness. Practising those behaviours day after day may gradually shift the underlying traits.
Major experiences matter too, though not always in obvious ways. Researchers have looked at events like job loss, divorce and recovery from illness, and the effects tend to be smaller and more varied than people expect.
Deliberate effort
One of the more encouraging areas of recent research looks at intentional personality change. When people set specific goals, such as "I want to be more organised" or "I want to worry less", and then practise concrete behaviours linked to those goals, some studies suggest their trait scores can shift modestly over weeks to months.
The key word is behaviours. Wanting to change is not enough on its own. What seems to matter is regularly acting in the new way until it starts to feel natural.
Therapy
There is also evidence that psychological therapies, which are usually aimed at problems like anxiety or depression rather than personality itself, are often associated with reductions in neuroticism. That makes sense: learning to manage worry and difficult emotions is close to what neuroticism measures.
How to work on a trait yourself
If there is a trait you would like to shift, a practical approach looks like this:
- Get a baseline. Take a free Big Five personality test so you know where you actually stand rather than guessing.
- Pick one trait and one direction. Trying to overhaul everything at once rarely works.
- Translate it into small behaviours. "More conscientious" becomes "write tomorrow's top three tasks before bed". "Less anxious" might mean "take a five-minute walk before reacting to stressful emails".
- Repeat in real situations. Traits are built through practice in everyday life, not through insight alone.
- Retest after a few months. Expect small shifts, not a transformation. Small, durable changes are the realistic goal.
Remember, too, that not every trait needs fixing. Lower agreeableness can make you a strong negotiator, and higher openness can sit alongside a love of routine. The aim is fit, not a perfect score. If you are thinking about where your traits fit best at work, see how your personality shapes your ideal career.
The bottom line
Your personality is fairly stable and partly heritable, but it is not set in stone. On average, people become more conscientious and agreeable and less neurotic as they mature, and the roles and habits you take on seem to play a part.
Change is usually gradual and modest. But with clear goals and consistent practice, you have more influence over who you become than "that's just how I am" suggests.
FAQ
At what age does personality stop changing?
There is no fixed age when personality stops changing. Traits tend to become more stable through early adulthood, but measurable change can continue into middle age and later life.
Can you change your personality on purpose?
Some research suggests you can shift a trait modestly by setting a specific goal and consistently practising the behaviours that go with it. Changes tend to be gradual rather than dramatic.
Is personality determined by genetics?
Genetics play a meaningful role, since Big Five traits are moderately heritable. But environment, experiences and the choices you make also shape how your personality develops over time.
