Nor does muscle and endurance in your youth equal longevity.
"Health" means different things to different people. An athlete might define health as physical strength, but another person might define health as the successful avoidance of illness and disease.
The longest living people who are super healthy in their 90s are not very muscular nor do they really partake in vigorous exercise. They're thinner people who didn't their lives eating little-to-zero meat and doing light physical activities like hiking.
