in my experience peoples fitness in their youth directly translates to vitality as an adult. gen z are just culturally indolent as fuck until they hit the workforce in their late teens. i was assistant manager at a grocery chain for a couple years during the rona after my other job laid me off. the gen z kids i dealt with and hired/trained there were almost all completely shitbagged for the first week or two just walking around stocking shelves. once their fitness level caught up they were fine, but most of them looked years older than they actually were. poor kids are gonna have a tough middle age.
Canada