Longevity Evidence Guide

This guide grades the main healthy-aging factors on a five-level scale - strong, moderate, emerging, mixed and insufficient - and states the basis for each rating with links to the primary source. Ratings describe how well a factor is studied in relation to healthspan outcomes, not how much it will help any individual.

Educational content only - not medical advice. In a crisis, call or text 988 (US) or your local emergency number. See crisis resources.