Accumulation of lipofuscin Aging brain Calorie restriction Cross-link Crosslinking of DNA Degenerative disease DNA damage theory of aging Exposure to ultraviolet light Free-radical damage Glycation Life expectancy Longevity Maximum life span Senescence Stem cell theory of aging See also Index of topics related to life extension ReferencesLoading content...Loading related searches...Wikiwand - on Seamless Wikipedia browsing. On steroids.