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Related Concept Videos

Aging01:26

Aging

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Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
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The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
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The Effect of Aging on Tissues01:19

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Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
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Replicative Cell Senescence02:15

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Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
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Age-related pharmacokinetic changes are extensively documented, but understanding age-related pharmacodynamic alterations is relatively limited. This knowledge gap can be partly attributed to the complexity of developing appropriate measures of drug responses compared to bioanalytical methods for determining drug concentrations.Most information regarding age-related differences in human pharmacodynamics originates from cross-sectional studies. However, these studies assume that observed mean...
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Geriatric patients show significant variation in how their bodies process medications, which can change how effective and safe treatments are. The liver is the primary organ where drug metabolism occurs, involving two main types of chemical reactions: phase I and II. Phase I metabolism is driven by the cytochrome P450 enzyme system, which includes key types such as CYP3A, CYP2D6, and CYP2C9. Research indicates that while aging doesn't notably alter the levels or activity of these enzymes, it...
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Why we age.

Michael S Ringel1

  • 1Life Biosciences, 75 Park Plaza, 3rd Floor, Boston, MA, 02116, USA.

Biological Reviews of the Cambridge Philosophical Society
|December 10, 2025
PubMed
Summary
This summary is machine-generated.

Evolutionary optimization theories best explain aging by considering resource constraints. This framework aligns with all current aging data, suggesting natural selection actively shapes lifespan.

Keywords:
ageingagingantagonistic pleiotropydisposable somahealthspanhyperfunctionlifespanlongevitymutation accumulation

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Area of Science:

  • Evolutionary biology
  • Gerontology
  • Biogerontology

Background:

  • Aging theories include mechanistic, weakening selection, and optimization perspectives.
  • Existing theories struggle to reconcile evolutionary forces with observed aging phenomena.
  • A comprehensive dataset of aging features now allows for rigorous testing of these theories.

Purpose of the Study:

  • To evaluate existing theories of aging against a broad dataset of empirical observations.
  • To determine which theoretical framework best explains the evolutionary basis of aging.
  • To test the prediction that lifespan-extending mutations reduce fitness under natural conditions.

Main Methods:

  • Comparative analysis of aging features across species and interventions.
  • Evaluation of data including caloric restriction effects, long-lived organisms, mortality plateaus, eusocial insect queen longevity, and lifespan malleability.
  • Assessment of evolutionary optimization theories against empirical evidence.

Main Results:

  • Optimization theories are the only framework that successfully explains all observed aging data.
  • Evidence supports the prediction that mutations extending lifespan generally reduce fitness in natural environments.
  • The evolutionary operation of natural selection in aging is a key finding.

Conclusions:

  • Evolutionary optimization theories provide the most robust explanation for aging.
  • The geroscience hypothesis, linking aging rate interventions to age-related disease modulation, is likely valid.
  • Lifespan manipulation through existing biological mechanisms is feasible based on optimization theory.