Spoken like someone that hasn’t been working very long, or if at all.
While school can be very pressure intense around exams in ways many jobs aren’t you at least have summer and other breaks. For work you get vacation time sure, but it’s nowhere near in terms of time.
Further adult life has a whole slew of responsibilities on top that you need to handle. Most 30+ can’t subside on the crap we ate during college, we can’t fuck off from our responsibilities when we can’t be arsed with minimal consequences and we sure as shit won’t find social stimulus without putting in effort, neither friends nor romantic. Sure if you live where you’ve always lived then you hopefully have childhood/school friends left at 30 but if you’ve moved then it’s not a given at all.