the scientific study of the biological process of aging.

organisms that reproduce only once, usually followed by death, as observed in several animals

a progressive deterioration of physiological function, an intrinsic age-related process of loss of viability and increase in vulnerability. In humans, aging is characterized by a complex phenotype

one of two or more variant forms of a gene.

inability to feed oneself due to anatomical deficiencies, common in the adult phase of some species of animals

programmed cell death.

theory

digestion of the cell's own components; it has been implicated in aging

diet regime consisting of eating considerably fewer calories, without malnutrition, that has been considered as a potential method to delay aging.

see replicative senescence.