In most countries, adulthood is legally defined as beginning at the age of 18.

Adulthood is characterized by increased responsibility, greater independence, and more freedom.

The primary tasks of adulthood include establishing a career, raising a family, and finding a life partner.

Adults often face challenges such as balancing work and family life, dealing with financial stress, and coping with the death of a loved one.

The average life expectancy in the United States is 78.6 years.

Common physical changes that occur in adulthood include graying hair, wrinkles, and loss of muscle mass.

Mild cognitive impairment is the term for the process of gradual cognitive decline that occurs in some adults as they age.

Common psychological changes that occur in adulthood include increased wisdom, greater emotional stability, and more realistic expectations.

Late adulthood is the term for the stage of adulthood that begins at around age 65.

Common challenges that adults face in late adulthood include dealing with retirement, coping with the death of a spouse, and managing chronic health conditions.

Positive aging, optimal aging, and healthy aging are all terms for the process of successful aging.

Factors that contribute to successful aging include good physical health, strong social support, and cognitive engagement.

Middle adulthood is the term for the stage of adulthood that begins at around age 40.

Common challenges that adults face in middle adulthood include dealing with the empty nest syndrome, coping with the death of a parent, and managing career changes.

Young adulthood is the term for the stage of adulthood that begins at around age 20.