Instead of telling your kids not to get too excited about being an adult, a better thing to do is to teach them how to handle stressful and difficult situations. How to avoid them and set themselves up for good things.

You're still young so you probably don't have much experience in these things.

Hoarding Bitcoin for them is also not a great strategy. Give an in experience kid Bitcoin what is he going to do? Continue having fun, not learn how to avoid terrible decisions, and then no experience on how to solve them.