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Aging01:26

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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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Unrealistic optimism bias is the tendency to overestimate the likelihood of positive outcomes. This cognitive bias makes individuals believe they are less likely to experience failures, setbacks, or risks and more likely to succeed than others. For example, people may assume they are less prone to health issues, accidents, or financial struggles than their peers, even when they share similar risk factors.One key component of this bias is the above-average effect, where individuals perceive...
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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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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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Reprogramming alters the gene expression in somatic cells, transforming them into induced pluripotent stem (iPS) cells over several generations. Scientists can reprogram cells by introducing genes for four transcription factors—Oct4, Sox2, Klf4, and c-Myc (OSKM) by viral or non-viral methods. These factors are also known as Yamanaka factors after Shinya Yamanaka, who first generated iPS cells using mouse skin cells. Yamanaka was awarded the Nobel Prize in Physiology or Medicine in 2012...
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Humans are very diverse and although we share many similarities, we also have many differences. The social groups we belong to help form our identities (Tajfel, 1974). These differences may be difficult for some people to reconcile, which may lead to prejudice toward people who are different. Prejudice is a negative attitude and feeling toward an individual based solely on one’s membership in a particular social group (Allport, 1954; Brown, 2010). Prejudice is common against people who...
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Author Spotlight: Automated Lifespan Monitoring – Discovering Aging Dynamics with the Lifespan Machine
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Is programmed aging a cause for optimism?

Josh Mitteldorf1

  • 1Massachusetts Institute of Technology, Cambridge, MA, USA. josh@mathforum.org.

Current Aging Science
|April 23, 2015
PubMed
Summary

Programmed aging, controlled by genetics, offers potential anti-aging targets. Some aging mechanisms may be reversible by restoring youthful hormonal signals, while others might be intractable.

Area of Science:

  • Evolutionary biology
  • Gerontology
  • Genetics

Background:

  • Aging is increasingly viewed as a genetically programmed process.
  • The programmed aging hypothesis is a significant area of research in gerontology.
  • Understanding aging mechanisms is crucial for developing anti-aging interventions.

Purpose of the Study:

  • To explore the implications of programmed aging for anti-aging science.
  • To identify potential targets and limitations for medical interventions in aging.
  • To differentiate between potentially tractable and intractable aging mechanisms.

Main Methods:

  • Review of current hypotheses in evolutionary biology and gerontology regarding aging.
  • Analysis of proposed mechanisms for programmed aging.

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  • Evaluation of evidence for different programmed aging scenarios.

    • Main Results:

    • Programmed aging suggests potential targets for mitigation and alleviation.
    • A promising hypothesis involves de-commissioned youthful maintenance machinery that could be reactivated.
    • Two intractable scenarios are proposed: aging by neglect and complex epigenetic clock control.

    Conclusions:

    • Programmed aging offers hope for anti-aging strategies, particularly through hormonal signal restoration.
    • Aging via neglect appears unlikely based on current evidence.
    • Epigenetic clock control remains a potential intractable mechanism for aging, requiring further investigation.