High school is the perfect time for a particular personality type.

Because you have most of an adult brain and body, but almost none of the responsibilities. So you are free to fight, fuck, and have fun without anyone finding it weird, but then you never have to deal with the consequences of that.

Its always been that way, and will always be that way. The only generational difference is a few decades ago college started to join it once it became "adult daycare" for most people.