The term for the gradual decline of functions associated with aging is senescence. This biological process encompasses various physiological changes, including diminished cellular activity, reduced repair mechanisms, and decreased functionality of organs and systems over time. Senescence impacts everything from skin elasticity to muscular strength and cognitive abilities. Understanding this concept is essential for developing strategies to mitigate age-related decline through proper nutrition, exercise, and lifestyle modifications. By addressing the factors associated with senescence, individuals can enhance their quality of life and promote healthy aging.