How to tell if you have a changeable personality according to science

Most individuals overestimate their capacity for personality change, a phenomenon psychologists attribute to the "better-than-average effect" or "wishful narcissism." This tendency leads people to view themselves as malleable and capable of significant transformation, rather than as creatures of habit with largely fixed potential. Evidence from high-school reunions suggests that fundamental personality traits persist over time, with individuals often exhibiting the same core characteristics they displayed in their youth, albeit in different social contexts. While physical appearance can change considerably, psychological makeup tends to remain consistent. This observation aligns with literary themes, such as in "The Godfather," where Michael Corleone's assurances of change are ultimately contradicted by his ingrained personality. Shakespeare's tragedies also frequently explore the idea that "character is destiny." Modern psychological research supports these notions, indicating that personality traits exhibit remarkable stability throughout adulthood, particularly after the age of 30. Longitudinal studies consistently demonstrate this enduring consistency.