The folks I follow on Twitter are discussing this. There's a legit theory that metabolic health is more important than age per se. Older people tend to be hit hardest because they tend to have the chronic diseases, but if you're 70 and in great health, you might be better off than your kids in their 40s and 50s with metabolic syndrome, etc. Example given is this family in which, tragically, the grandma passed on not knowing that her two oldest kids died before her.