Why and how are we living longer?

Area of Science:

• Physiological sciences
• Gerontology
• Evolutionary biology

Background:

• Human life expectancy is increasing due to falling death rates in advanced ages.
• Aging is increasingly understood not as a programmed process but as accumulated molecular and cellular damage.
• Evolutionary resource allocation prioritizes reproduction over long-term maintenance, leading to damage accumulation.

Purpose of the Study:

• To examine the physiological basis of aging and its impact on life expectancy.
• To assess prospects for extending health span (period free of age-related disease).
• To understand the malleability of the aging process and influencing factors.

Main Methods:

• Review of current understanding of physiological aging.
• Analysis of evolutionary pressures on resource allocation and maintenance.
• Assessment of factors influencing health trajectories in old age.

Main Results:

• Aging is a side effect of evolutionary optimization, not an active program.
• Lifelong accumulation of molecular and cellular damage drives the aging process.
• The aging process is more malleable than previously thought.

Conclusions:

• Understanding the physiological basis of aging is crucial for extending health span.
• Identifying factors governing aging malleability is urgent for public health.
• Interactions between biological, social, and lifestyle factors shape health in old age.