Antonio Terracciano, PhD, Laboratory of Personality and Cognition, National Institute on Aging (NIA), National Institutes of Health (NIH), U.S. Department of Health and Human Services (DHHS), Baltimore, MD, USA.
Robert R. McCrae, PhD, Laboratory of Personality and Cognition, NIA, NIH, DHHS, Baltimore, MD, USA.
Paul T. Costa Jr., PhD, Laboratory of Personality and Cognition, NIA, NIH, DHHS, Baltimore, MD, USA.

Individual differences in personality traits are generally stable during adulthood; where there are changes, they are generally in the direction of greater maturity. The trends are similar for men and women and across cultures. With advancing age, people generally become more emotionally stable, agreeable, and conscientious, with better impulse control, but less active and less open to new actions and values than younger individuals. Those trajectories provide several insights into adult development, challenging some negative stereotypes about older adults and serving as a reminder that enduring individual differences are more important than age in understanding personality.
Key words: personality traits, aging, cross-cultural, depression, Alzheimer’s disease.