Children need to learn financial literacy. After 10-20 years, other assets may appear and they should be ready to recognize the benefits in new tools.
Most kids understand about managing finances is when junior high school, it seems useless to teach bitcoin to children before junior high school because they will not understand, so wait for the right age to teach bitcoin.
I don't think it is useless.
In my opinion kids should be given control over a a very small level of their own finances at a very young age. Then thought the concepts of finance and the time value of money. Too many people don't understand the concepts behind our financial system and the level of freedom it gives them. They blame their bad management of personal finances on the system rather than taking the time to learn how to use it.
Saving/investing money from an early age and allowing it to compound is the only way to financial freedom.