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Related Concept Videos

Aging01:26

Aging

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...
The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

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...
Pharmacodynamics in Geriatric Patients: Effects of Age01:27

Pharmacodynamics in Geriatric Patients: Effects of Age

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...
Drug Dosing: Geriatric Patients01:15

Drug Dosing: Geriatric Patients

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...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption01:22

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Absorption

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...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution01:00

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Distribution

Drug distribution in the human body is influenced by several factors, including plasma protein concentration, body composition, blood flow, tissue-protein concentration, and tissue fluid pH. Among these, changes in plasma protein concentration and body composition due to aging significantly affect how drugs are distributed within the body. Specifically, aging is associated with a decrease in albumin levels by about 10% and an increase in α1-acid glycoprotein levels. These alterations are not...

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Related Experiment Video

Updated: Jun 4, 2026

A Suppressor Screen for the Characterization of Genetic Links Regulating Chronological Lifespan in Saccharomyces cerevisiae
10:39

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Published on: September 17, 2020

What can we learn from (and about) global aging?

Arie Kapteyn1

  • 1Labor and Population, RAND Corporation, 1776 Main Street, Santa Monica, CA 90407, USA. kapteyn@rand.org

Demography
|February 9, 2011
PubMed
Summary
This summary is machine-generated.

Global aging varies significantly, creating a natural experiment for policy analysis. Comparing international data requires careful modeling of institutional and response differences to understand policy impacts on aging populations.

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Area of Science:

  • Gerontology
  • Public Policy
  • Comparative Analysis

Background:

  • Aging is a global demographic trend with significant cross-national variations in speed and composition.
  • Countries implement diverse policies to address aging populations, creating unique societal contexts.

Purpose of the Study:

  • To explore conditions under which cross-national data can be validly used for inferring policy effects on aging.
  • To highlight the importance of understanding institutional and response style variations in comparative studies.

Main Methods:

  • Discusses theoretical frameworks for cross-national data inference.
  • Emphasizes the need for careful modeling of country-specific factors.

Main Results:

  • Identifies circumstances where international data is suitable for policy effect inference.
  • Underscores the challenges posed by institutional and response heterogeneity.

Conclusions:

  • Cross-national comparative research on aging policy is feasible but requires rigorous methodological approaches.
  • Accurate inference necessitates accounting for institutional and behavioral differences across countries.