When they have the idea of money, I will teach them how to use cryptocurrency to pay and teach them the knowledge of cryptocurrency. Many children already know cryptocurrency. When they are very young, I will teach them to pay in cryptocurrency, and when they are adults, I will teach them how to invest in cryptocurrency.
You can teach them about the economy way earlier than that, many people do not really understand how the economy works, when I touch the topic many people still believe that our currency is backed by gold, and when I tell them this is not the case and that currencies are not backed by anything they do not believe me, they think that such a thing cannot be possibly true as the system will be a lie in that scenario, but if you teach your kids from an early age then they will understand this concept and why something like bitcoin is needed.