Evidence: Established — Sleep, physical activity, diet quality, and social connection are supported by decades of consistent human evidence and public-health consensus.
Movement, Strength & Mobility
Strength, cardiorespiratory fitness, and mobility are among the best-supported predictors of healthy aging.
Guides
What remains uncertain
Every topic on this site has open questions — that's how science
works. Individual guides call out specific uncertainties, and our
methodology explains how we grade what we
publish.