Longevity

Longevity is where every other page on this site converges. The five systems — heart, metabolism, brain, muscle, sleep — age together, and the interventions that protect them are the same boring, compounding pillars: fitness, strength, food pattern, sleep, connection. The famous cohorts measure this directly: cardiorespiratory fitness stands as the strongest single predictor of all-cause mortality, with low fitness rivaling smoking and diabetes as a risk factor; grip strength predicts survival; and social connection's mortality risk compares, in meta-analysis, with established lifestyle risks.

The honest distinction the industry skips: lifespan is the years; healthspan is the point — the years spent sharp, mobile, and independent. The blue zones — five regions of exceptional longevity — observed the same pillars: natural daily movement, purpose, community, and plant-forward eating. And the frontier — NAD boosters, senolytics, repurposed drugs — is genuine biology moving through early human evidence. The hub below links to each; the grading stays honest: the frontier is promising and unproven, the pillars are proven and compounding.

• No supplement has been shown to extend human lifespan. The pillars have.
• VO2 max is the strongest single mortality predictor measured — fitness is lifespan currency.
• Muscle is aging armor: grip strength predicts survival, muscle is the metabolic reserve of aging.
• Connection's mortality risk rivals the classic lifestyle risks — the most under-invested pillar.
• Healthspan, not lifespan, is the metric worth optimizing.