All in? HELL NO, nobody should go all in, regardless of age. Taking higher risks when younger--that's all well and good. But going all-in on anything crypto is a recipe for bankruptcy. I wouldn't even allocate 20% to crypto. You'd have to be crazy to go even half-in, and I say that as a person who likes bitcoin. A lot. It's just way too risky.
Exactly this is not a good if all young people should go on bitcoin. We are not sure if they will become successful here. I thing young people should focus first to their study, bitcoin will help them to achieve their goal but not 100% because as like what you've said bitcoin is too risky in some point.
Start as early as you can, that is what kind of mind set i have and i stick to that because i think it is true that if you start early then you will finish the game early. It is a good start for the young people like teens to start accepting and embracing these kinds of opportunities in the internet and there is nothing wrong if they will get a loss or made a mistakes because it is normal and as long as they are continue moving then they will succeed.