[adamredwoods]

My father is doing poorly, and he is just around this "median" age. He has a chronic disease which somewhat contributed to him not moving around much. Largely sedentary, but not over-weight.

On the other hand, my in-laws are doing very well, into their 80's. They take walks, attend talks, stay active. They don't have any substantial diseases.

So IMO, the revolutionary enhancements will come from controlling diseases, so those with diseases do almost as well as those without.