Longevity doesn't start in an oxygen chamber

The goal is healthspan: the years you live in good health and independence, not just the number of years. That shifts attention from spectacular interventions to the factors that decide whether you can still climb stairs, think clearly and live on your own at 80.

• Cardiorespiratory fitness (VO2 max): one of the strongest predictors of long-term survival; it responds to training at any age.
• Muscle strength: protects independence, metabolism and bones.
• Sleep: including screening for sleep apnea, which is common and often missed.
• Metabolic health: blood pressure, lipids such as ApoB, and blood sugar.
• Social ties and purpose: less measurable, but consistently linked to better outcomes.

Hyperbaric oxygen therapy is an established treatment for specific medical indications, such as carbon monoxide poisoning, decompression sickness and certain hard-to-heal wounds. Its use to slow aging in healthy people is unproven. The study most often cited — 35 healthy adults over 64, 60 sessions at 2.0 atmospheres, published in 2020 — reported longer telomeres and less immune-cell senescence. It had no control group and measured cell markers, not disease or lifespan. Epigenetic clocks are a promising research field, but a better clock reading is not yet proof that a therapy works.

More oxygen, more supplements, more biomarkers, more interventions don't add up to more health without a clear reason. Each test can trigger follow-ups; each therapy has costs and risks. The best longevity plans are short: a baseline, a few priorities, and a re-check that shows whether they worked.

New tools will come — organ-specific aging clocks, drugs that act on several aging processes, possibly cellular reprogramming. The fundamentals won't change: measure, prioritize, act, measure again.

If you have one hour and one budget for longevity, spend it on fitness, strength, sleep and metabolic health first. Spectacular therapies can come later — if there's a reason and a way to measure the effect.