ABSTRACTAlthough research on personality and behavioral genetics has focused on the continuity of traits, both fields and their interface will profit from the consideration of trait change In this article we review personality research on age differences in hentabdity and propose the counterintuitive hypothesis that, when developmental changes in hentabihty are found, hentability tends to increase We also focus on behavioral genetic analyses of long‐term developmental change Research to date suggests that genetic involvement in adult personality change is slight whereas personality change in childhood is governed substantially by genetic factors Finally, we consider a new topic, genetic influence on short‐term change in persona