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Why We Age: The Biology of Senescence and What Science Is Learning to Do About It

@garagelab | 2026-05-12 23:23:17 |

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Aging has always seemed like an immutable fact of biology. In the last decade, that assumption has been fundamentally challenged. The identification of specific, targetable biological mechanisms that drive aging — and the demonstration in animal models that intervening in those mechanisms can extend healthy lifespan — has moved longevity research from speculation toward serious science.

**[Why We Age: The Biology of Senescence and What Science Is Learning to Do About It](/node/1447)** covers the hallmarks of aging framework: genomic instability, telomere shortening, cellular senescence, mitochondrial dysfunction, and others. It then looks at the most promising interventions — caloric restriction mimetics like rapamycin, senolytics that clear senescent cells, and the controversial frontier of epigenetic reprogramming.

The honest assessment is that meaningful human healthspan extension probably remains in the 2030s+ timeline, and translating rodent results to humans has historically been difficult. But the mechanistic understanding is deepening faster than at any previous point, and the field has attracted extraordinary scientific talent and capital.

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