I took my Dad out of coffee in my home town and met a guy who looked at least a decade older than me who said he remembered me from high school. Then he said I probably wouldn't remember him because I was older and in grade 12 when he was in grade 9. My Dad said after ward, "I didn't know if he was saying he went to high school with you or me"
Some of my classmates look pretty rough. Others remain vital.
I'm sure genetic and zip code lottery are huge factors. But the kids who never stopped partying are much worse for the wear.