Bitcoins have been over a couple of hundred dollars for more than 5 years now. Kids can only get so many by mining. Don't imagine too many teenagers have 10+ bitcoins without family help in getting them.
You can not for sure judge the set of people who have the most bitcoin for sure, except you actually carried out a research on this. For me I like to think that those who even hold a meaningful amount of bitcoin as early adopters were risk takers who just wanted to gamble with the little the could afford to lose.
I agree.I think the early adopters have more bitcoins at the moment with their ages from 30 to 40.But i don't think young ones at their 20's might have more interests on mining.Their minds are still focused with fancy things around.Unlike family men who really strive hard to have a bright future for their kids and so their focus might be on mining bitcoins.