A psychologist spends his entire career studying how and why changes occur in people as they get older. This psychologist is most likely a(n) __________ psychologist.

A) evolutionary
B) personality
C) health
D) developmental

The psychologist who studies changes in people as they get older is most likely a developmental psychologist, as this field focuses on the stages and processes of growth, development, and aging throughout the lifespan. Evolutionary psychology focuses on how natural selection has shaped human behavior, personality psychology focuses on understanding individual differences and traits, and health psychology focuses on the role of psychological factors in promoting health and preventing illness.