Between adolescence and adulthood, you go through a host of changes — jobs, regrettable haircuts and relationships that come and go. But what about who you are at your core? As you grow older, does your personality change?
Personality is the pattern of thoughts, feelings and behaviors unique to a person. People tend to think of personality as fixed. But according to psychologists, that’s not how it works. “Personality is a developmental phenomenon. It’s not just a static thing that you’re stuck with and can’t get over,” said Brent Roberts, a psychologist at the University of Illinois at Urbana-Champaign.
That’s not to say that you’re a different person each day you wake up. In the short term, change can be nearly imperceptible, Roberts told Live Science. Longitudinal studies, in which researchers survey the personalities of participants regularly over many years, suggest that our personality is actually stable on shorter time scales.
Related: Why do people have different personalities?
In one study, published in 2000 in the journal Psychological Bulletin, researchers analyzed the results of 152 longitudinal studies on personality, which followed participants ranging in age from childhood to their early 70s. Each of these studies measured trends in the Big Five personality traits. This cluster of traits, which include extroversion, agreeableness, conscientiousness, openness to experience, and neuroticism, are a mainstay of personality research. The researchers found that individuals’ levels of each personality trait, relative to other participants, tended to stay consistent within each decade of life.
That pattern of consistency begins around age 3, and perhaps even earlier, said Brent Donnellan, professor and chair of psychology at Michigan State University. When psychologists study children, they don’t measure personality traits in the same way they do for adults. Instead, they look at temperament — the intensity of a person’s reactions to the world. We come into the world with unique temperaments, and research suggests that our temperaments as children — for example, whether we’re easy going or prone to temper tantrums, eager or more reluctant to approach strangers — correspond to adult personality traits. “A shy 3-year-old acts a lot different from a shy 20-something. But there’s an underlying core,” Donnellan told Live Science.
Earlier temperament seems to affect later life experience. For example, one 1995 study published in the journal Child Development followed children from the age of 3 until the age of 18. The researchers found, for instance, that children who were shyer and more withdrawn tended to grow into unhappier teenagers.