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As metabolic rate increases, the lifespan of an organism is expected to decrease as a direct result. The rate at which this occurs is not fixed and thus the -45° slope in this graph is just an example and not a constant. The rate of living theory postulates that the faster an organism's metabolism, the shorter its lifespan.
"The key conceptual insight that allowed Medawar, Williams, and others, to develop the evolutionary theory of aging is based on the notion that the force of natural selection, a measure of how effectively selection acts on survival rate or fecundity as a function of age, declines with progressive age." [39]
Rate of living theory of aging; Reproductive exhaustion theory of aging; Reproductive-cell cycle theory; S. Selectivity theory (aging) Socioemotional selectivity theory;
Biological immortality (sometimes referred to as bio-indefinite mortality) is a state in which the rate of mortality from senescence (or aging) is stable or decreasing, thus decoupling it from chronological age. Various unicellular and multicellular species, including some vertebrates, achieve this state either throughout their existence or ...
Senescence (/ s ɪ ˈ n ɛ s ə n s /) or biological aging is the gradual deterioration of functional characteristics in living organisms. Whole organism senescence involves an increase in death rates or a decrease in fecundity with increasing age, at least in the later part of an organism's life cycle.
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
In fact, the rate for men in this group is almost twice as high than it is for males age 15 to 24. Between 2001 and 2022, suicide rates actually increased significantly for men and women over 55 ...
The compensation law of mortality (late-life mortality convergence) states that the relative differences in death rates between different populations of the same biological species are decreasing with age, because the higher initial death rates are compensated by lower pace of their increase with age. The disputed late-life mortality ...