I don't imagine teenagers have +1 BTC to be honest, where would they get them from?
Asking their parents to withdraw part of their savings?
Okay, they might have been able to buy some through a holiday job or whatever, but they're teenagers.
They probably spend most of that money on other stuff, like a car (in the US) or on a holiday with their friends perhaps.
I remember reading lots of posts by teenagers mining Bitcoin in 2012 with their GPUs for some extra cash even though they had no idea what it's purpose was, so you never know. I doubt that many of them held on to their coins through all these years unless they were believers though.