Biological theories of aging focus on the cellular and molecular changes that occur in the body over time, leading to a decline in physical and cognitive function.

The Wear-and-Tear Theory proposes that aging is a result of the accumulation of cellular damage over time, caused by factors such as free radicals and oxidative stress.

Disengagement Theory posits that as individuals age, they gradually withdraw from social interactions and activities, leading to a decrease in social engagement and involvement.

The Activity Theory suggests that older adults who engage in meaningful activities and maintain an active lifestyle are more likely to experience a sense of well-being and life satisfaction.

The Socioemotional Selectivity Theory proposes that as individuals age, they become more selective in their social interactions, prioritizing long-term and emotionally meaningful relationships over superficial or casual ones.

Psychological theories of aging explore the impact of psychological and emotional factors, such as personality, coping mechanisms, and self-perception, on the aging process and well-being of older adults.

The Life Course Perspective emphasizes the interplay between genetics and social factors in shaping the aging process and experiences of older adults.

The Neural Degeneration Theory proposes that aging is associated with a decline in cognitive abilities due to the degeneration of neural connections and the loss of neurons in the brain.

The Free Radical Theory suggests that aging is a result of the accumulation of free radicals, which are unstable molecules that can damage cells and tissues over time.

Social theories of aging focus on the impact of social factors, such as social support, social roles, and cultural norms, on the aging process and experiences of older adults.

The Continuity Theory suggests that older adults tend to maintain their established patterns of behavior and personality traits throughout the aging process.

Biological theories of aging explore the role of genetics and genetic programming in determining the rate and progression of the aging process.

The Socioemotional Selectivity Theory proposes that older adults prioritize long-term and emotionally meaningful relationships over superficial or casual ones.

The Sarcopenia Theory proposes that aging is associated with a decline in physical abilities due to the loss of muscle mass and strength, which can lead to reduced mobility and functional limitations.

The Life Course Perspective emphasizes the interplay between genetics and social factors in shaping the aging process and experiences of older adults.