We still don't have any 80+ year olds who have been striving for longevity since their 20s. Nutrition labels and ingredient lists on food didn't even exist the

We still don't have any 80+ year olds who have been striving for longevity since their 20s. Nutrition labels and ingredient lists on food didn't even exist the 90s. An 80 year old was born into a world of nonstop cigarettes, drinking while pregnant, etc. So our current obsession with longevity through fitness and nutrition is new and we can't really tell what someone like Bryan Johnson will be like at 80. If he is significantly declined in 20 years despite his rigorous longevity routine then we will know.