They seem "old" to me, even though they're often several years younger than me. As though they've lived a lot more life than me, but not the "good" parts of life. I can't imagine how tough it must be to raise a family on an entry-level job, and simultaneously try to progress your way out of that entry-level-ness without the ability to ever roll the dice and not have to worry about feeding anybody else but yourself if things don't work out. Or the ability to put it all on hold and piss off to backpack around Southeast Asia for a year. You can see the shadow of that still on a lot of folks like that, even 20 years on.
It never occurred to me back then how good a decision it was not to get married and start a family right away. Now, raising kids with 20 years worth of leveling up behind me and the resources to do it "right", I think I'm going to have it a lot easier.