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.
Bitcoin is maturing, and so are its holders.
Alts are probably a different story
Personally, I think the target market of Bitcoin is the young people because they are expose in the technology thats why its a good idea to target the young ones. In this era, teenagers are very confuse to use technology they explore a lot of things and they are also easy to learn when it comes to block chain. Nowadays, young people can earn profit in their age with the help of technology