Another obvious confound is that body builders engage in regular resistance exercise which is proven to promote skeletal, muscular, and neural health. Anecdota

Another obvious confound is that body builders engage in regular resistance exercise which is proven to promote skeletal, muscular, and neural health. Anecdotally I know a man who is in his 90s and still lifts and cycles regularly and has for the past 40 years. He is definitely suffering the effects of aging, but when, for example, he falls his bones don't break and he's able to continue on. He's dealt with other medical conditions that normally wouldn't be treated in a man his age. But because of his good health, the doctors have gone ahead and gotten good outcomes. He also hasn't drank or smoked in the past 40 years either though, so there's another confound.