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Does aging stop?

Parvin Shahrestani1, Laurence D Mueller, Michael R Rose

  • 1Department of Ecology and Evolutionary Biology, University of California, Irvine, California 92697-2525, USA. pshoejae@uci.edu

Current Aging Science
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Summary
This summary is machine-generated.

Mortality rates stabilize at very late ages in various species, suggesting aging may stop. This challenges lifelong heterogeneity theories and supports evolutionary explanations for mortality plateaus.

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Area of Science:

  • Gerontology
  • Evolutionary Biology
  • Demography

Background:

  • Human mortality data show stabilization at very late ages but are confounded by external factors.
  • Similar mortality-rate plateaus observed in diverse species like medflies, fruit flies, and nematodes in the 1990s.
  • These plateaus necessitate theoretical explanations in biology.

Purpose of the Study:

  • To investigate the biological basis of mortality-rate plateaus observed in late-life.
  • To differentiate between lifelong heterogeneity and evolutionary theories explaining these plateaus.
  • To explore the implications of mortality-rate plateaus for aging research and understanding aging processes.

Main Methods:

  • Analysis of human and various invertebrate mortality data to identify late-life mortality rate stabilization.
  • Experimental testing of predictions derived from lifelong heterogeneity theories.
  • Experimental testing of predictions derived from evolutionary theories of aging, including Hamiltonian theory.

Main Results:

  • Experiments have cast doubt on lifelong heterogeneity as the sole explanation for mortality-rate plateaus.
  • Several experiments have corroborated evolutionary (Hamiltonian) theories.
  • Evidence suggests that aging may indeed stop in some populations at sufficiently advanced ages.

Conclusions:

  • Mortality-rate plateaus in late life are a reproducible phenomenon across species.
  • Evolutionary theories provide a more robust explanation for these plateaus than lifelong heterogeneity.
  • The possibility that aging can cease has profound implications for aging research, suggesting distinct adult physiologies before and after aging stops.