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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.
Cellular Clock Theory
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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Mitochondria01:37

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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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Drug Dosing: Geriatric Patients01:15

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Elderly individuals encompass a diverse population with varying degrees of age-related physiological changes. Defining the elderly presents challenges, as the geriatric population is often arbitrarily categorized as individuals older than 65. However, many individuals in this group lead active and healthy lives, with an increasing number surpassing 85 years and falling into the older elderly category. Physiological changes associated with aging impact performance capacity and homeostatic...
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Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

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As individuals age, their body's physiology evolves, affecting drug pharmacokinetics. The most apparent changes occur in the gastrointestinal tract, where an increase in gastric pH, a delay in gastric emptying, and a reduction in gastrointestinal motility are observed. Remarkably, these changes do not substantially modify the absorption of orally administered drugs, particularly those absorbed via passive diffusion.Transdermal drug delivery emerges as a highly viable method for older adults due...
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Cognitive Development During Adulthood01:30

Cognitive Development During Adulthood

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Cognitive development continues throughout adulthood, undergoing significant shifts across early, middle, and late stages. Individual transition occurs from adolescent idealism to pragmatic and adaptable thinking in early adulthood. During this period, individuals learn to integrate personal beliefs with the recognition that other perspectives are equally valid. Exposure to the complexities of modern society, diverse experiences, and higher education contribute to this adaptive thought process,...
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Related Experiment Video

Updated: Dec 8, 2025

Surveying Low-Cost Methods to Measure Lifespan and Healthspan in Caenorhabditis elegans
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What if there's no such thing as "aging"?

Alan A Cohen1, Véronique Legault2, Tamàs Fülöp3

  • 1Groupe de recherche PRIMUS, Department of Family Medicine, University of Sherbrooke, 3001 12e Ave N, Sherbrooke, QC J1H 5N4, Canada; Research Center on Aging, 1036 Rue Belvédère S, Sherbrooke, QC J1H 4C4, Canada.

Mechanisms of Ageing and Development
|September 19, 2020
PubMed
Summary

Aging is not a single biological process but a collection of diverse phenomena. Challenging the idea of unitary aging can accelerate scientific discovery across multiple biological levels.

Keywords:
Bow-tieComplex systemsInformation theoryLinguisticsNeural networkParadigmPhilosophy of scienceSapir-Whorf

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Area of Science:

  • Gerontology
  • Evolutionary Biology
  • Molecular Biology

Background:

  • The concept of aging is frequently debated, with questions arising about its definition, mechanisms, and universality across species.
  • The colloquial and scientific use of the term "aging" may create a cognitive bias towards assuming a single, unified biological phenomenon.

Purpose of the Study:

  • To investigate whether aging represents a unitary biological phenomenon or a collection of disparate processes.
  • To examine the evidence supporting or refuting the concept of unitary aging across various biological scales.

Main Methods:

  • Analysis of evidence from cellular/molecular, clinical, demographic, and evolutionary levels.
  • Critical evaluation of the cognitive biases associated with the term "aging".

Main Results:

  • Evidence across multiple biological levels indicates that aging is not a unitary phenomenon.
  • Known aging pathways produce heterogeneous outcomes rather than a single, coordinated process.

Conclusions:

  • The assumption of unitary aging can lead to misguided research questions and hinder scientific progress.
  • Moving beyond the notion of unitary aging can refine research paradigms and accelerate discoveries in aging biology.