Related Experiment Video
Updated: Mar 16, 2026
08:53
Author Spotlight: Automated Lifespan Monitoring – Discovering Aging Dynamics with the Lifespan Machine
Published on: January 26, 2024
1.7K
Can aging be programmed? A critical literature review.
Axel Kowald1, Thomas B L Kirkwood1,2
1Institute of Cell and Molecular Biosciences, and Institute for Ageing, Newcastle University, Campus for Ageing and Vitality, Newcastle upon Tyne, NE4 5PL, UK.
Aging Cell
|August 19, 2016
Summary
The evolution of aging is not genetically programmed. This study found no scientific support for programmed aging theories, reinforcing evolutionary explanations for aging processes.
Area of Science:
- Evolutionary biology
- Gerontology
Background:
- The evolutionary basis of aging remains a complex biological question.
- Medawar's theory posits that declining natural selection with age explains aging due to environmental risks.
- Recent hypotheses suggest aging might be genetically programmed, with significant implications for aging research.
Purpose of the Study:
- To critically evaluate specific theories proposing genetically programmed aging.
- To determine the validity of programmed aging hypotheses through rigorous analysis.
Main Methods:
- Detailed examination of proposed programmed aging theories.
- Scrutiny of theoretical assumptions.
- Simulation of model outcomes.
Main Results:
- None of the examined programmed aging theories withstood critical analysis of their assumptions or simulation results.
- Evidence does not support the concept of genetically programmed aging.
Conclusions:
- Non-programmed aging theories, building on Medawar's insights, provide the most robust explanation for the evolution of aging.
- The idea of programmed aging lacks scientific validation.
- Further research should focus on established evolutionary theories of aging.
Related Concept Videos
01:27Pharmacodynamics in Geriatric Patients: Effects of Age
308
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...
308
01:30Cognitive Development During Adulthood
1.1K
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,...
1.1K
02:15Replicative Cell Senescence
3.4K
3.4K
01:18Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Metabolism
298
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...
298
01:15Drug Dosing: Geriatric Patients
340
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...
340
01:24Revisionist Views of Adolescent and Adult Cognition
364
A revisionist approach to Jean Piaget's theory of cognitive development has brought new insights that challenge and reinterpret his established ideas. Piaget proposed that the formal operational stage, emerging in adolescence, represents the culmination of cognitive maturity. During this stage, individuals are said to develop abstract thinking, engage in systematic problem-solving, and show a form of egocentrism, believing others are as preoccupied with their behavior as they are...
364