Gaming

200; It's pretty hard to play if you're dead

Anyone who thinks differently is not for you. People can do almost whatever they want for fun, as long as it's legal. Labeling someone childish because they like something is stupid; what am I going to do, drink all day, go to bars, hike, travel, play sports, do n'th paid activity, etc? Some people have the time, money or health that allows or disallows them to do these things, and some people do or don't have the interest. Tons of people enjoy watching tv shows. Are we supposed to grow out of that too? By that logic, we shouldn't enjoy anything we did as kids and just do things only relegated to adults.

Id say most people regardless of when they were born think like this unless they themselves play games. It's more socially acceptable amongst the younger generation right now (e.g. college graduates) and probably because they're still considered young. Kids have more free time than adults and the barrier to entry for them is low. Parents often see their kids playing games and in genral have a negative attitude towards them for consuming time. Id say as people go into their 30s and 40s its considered less acceptable because societal expectations are that people will work and get married and have kids by then, and they'd have less time for solo activities. Going to the bar while having young kids or other activities is less acceptable. As kids get older their parents have more time for fun, but playing games is seen as childish because they either see their kids playing or because its something from their own childhood and other ventures that cost money like travel are now available to them when they werent as kids