There is great variability in the degree to which people age and experience health problems in middle adulthood.

According to your text, the most influential developmental psychologist of the 20th century was a. Lev Vygotsky

b. Sigmund Freud. c. Paul Baltes. d. Jean Piaget.

Emerging adulthood typically ranges from the ages of ______.

A. 18-25 B. 16-19 C. 22-29 D. 25-30