The document discusses the impact of aging on physiology, psychology, and social-emotional functioning. Physiologically, aging leads to declines in senses like vision and hearing, changes in skin and hair, loss of muscle and bone mass, and decreased function of organs like the heart, kidneys, and gastrointestinal system. Psychologically, cognitive functions like memory typically decline with age, though intelligence and personality remain stable. Rates of depression also tend to increase in older adults. Socially and emotionally, retirement, loss of friends and family, loneliness, and loss of independence can negatively impact well-being and self-esteem in aging individuals.