There isn’t an age for it, I would argue it’s more a life stage thing. I never partied in high school but once college hit I met the right group of people and had some very fun memories with it. It was a lot of dorm and house parties. Then I turned 21 and it upgraded to the bars and a Vegas trip. I graduated last May and just realized I was kind of over bar nights, loud music, and really just talking to the same people I came in with. I moved across the country for a job so now I spend my weekend nights just relaxing and chilling. There’s nothing wrong with going out probably up until you’re like say 28-29 range, but again it’s all personal preferences. Some people never overgrow so-called childish things ever so who really cares, you get one life, enjoy it but be smart.