The document discusses physical, cognitive, social, and personality development that occurs during middle adulthood from ages 40-65. Physically, people experience a gradual decline in height, weight, strength and sexual functioning. Cognitively, risks for heart disease and cancer increase. Socially, adults may experience an empty nest or become part of the sandwich generation, caring for children and parents. In terms of personality, midlife crises are now seen as a normal transition and generativity vs. stagnation becomes an important life task.