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.
Not all young people should go all in on bitcoin because they have their own decision in life. Remember the 12 years old child became a millionaire because of bitcoin? That's true, and even young people could possibly like this. They take the opportunity of bitcoin. Taking risk would lead you to know the truth.
Well, If I have a child someday, I would teach them how to do bitcoin even if they are so young.