Longevity Score.

This is a six-pillar lifestyle audit, not a biomarker-based clock. The pillars — sleep, nutrition, movement, stress, social connection, and sense of purpose — were chosen because each has independent, well-replicated associations with all-cause mortality and healthspan. The score is a fast, free screen of which pillar is dragging your risk profile.

The headline number to keep in mind: Li et al. (2018, Circulation) tracked over 120,000 adults for up to three decades and found that adopting five low-risk lifestyle factors (never smoking, healthy BMI, ≥30 min daily activity, moderate or no alcohol, healthy diet) added ~12 years of life expectancy for women and ~14 for men compared with adopting none. Lifestyle is dose-responsive across this entire distribution.

Social isolation and weak social ties carry mortality risk on the order of smoking 15 cigarettes a day — Holt-Lunstad’s 2010 meta-analysis of 148 prospective studies found a 50% increased likelihood of survival for people with stronger social relationships. Most longevity programs under-weight this because it is harder to prescribe than a protein target.

Sense of purpose is similarly load-bearing: Cohen et al. (2016) and the English Longitudinal Study of Ageing both showed that a higher purpose score predicted lower all-cause mortality independent of physical health, depression, and income. The mechanism is partly behavioral (people with purpose adhere to health behaviors better) and partly biological (lower cortisol, better inflammatory profile).

The pillar with the lowest score is your highest-yield intervention — not the one you find most interesting. If sleep scored a 4 and you spend your free hours optimizing supplements, you are leaving the largest available gain on the table. Fix the worst pillar first; the others tend to improve secondarily because sleep, stress, and movement are tightly coupled.

Treat this score as a screening tool, not a diagnosis. For an objective companion metric, pair it with a biological age estimator and an annual lipid + HbA1c + ApoB + hs-CRP panel. The score tells you what to change; the bloodwork tells you whether the changes worked.