Lol those poor lightweight 84-year-olds need to gain weight if that’s the case! You’re referencing the feeble and sadly there are many and a lot of it is by choice not just because of “natural aging”. I even hate to use that word elderly nowadays especially, because some of these older folks can be as active as a 55 year old given the right genetics, diet, and lifestyle. I’ve open my eyes more because my 19 yo daughter recently called me an “ageist” due to a comment I had made. She reminded me of how I talk about looking at the individual first and foremost lol So yeah there are 84-year-olds about ready to drop over from a strong wind (sad imo because usually it doesn’t have to be that way) and there are 84-year-olds jogging the beach daily. Some might be a little slow but they’re out there jogging! Anyway, my point is to just note that the claim that all “fill in the blank here with most any category” are just the same. Same thing on the other end of the spectrum for toddlers- no two are exactly alike unless you’re talking about identical twins, and even then studies are showing that are still differences due to environmental influence on personalities.
I know your post was at least half in jest, but interested in your thoughts.