I'd have to disagree this time. I'm in nearly early 20's and there's not really a prevailing and counter culture. Just two dozen different intercting culture. The lack of a overbearing monoculture does make it hard to effectively rebel.

So what is the counter culture these days?

I go to underground parties all the time and I actually don't see many people that seem younger than mid to late 20's.

Mostly late 20's early 30's millennials, and the crust punks of the 70's and 80's/