Age-associated decline refers to the gradual deterioration of physiological functions and cognitive abilities that occurs as individuals age. This decline can affect various aspects of the body, including muscle strength, vision, hearing, memory, and overall physical health. As people grow older, they may experience decreased mobility, slower reaction times, decreased immune function, and a higher risk of chronic diseases such as heart disease and Alzheimer's. Scientists and researchers study age-associated decline to better understand the mechanisms behind aging and develop strategies to promote healthy aging and improve quality of life in older adults.