Most kids from 7 years of age up to 12years old are focus on play. I think we dont need to rush them because at their age its not
the right time yet to do it. Kids must enjoy their childhood period besides bitcoin is not forcing anyone to take it. But it is a real
big help to people
Introduction would be enough, telling the basics. It could help them in the future so they won't be asking too many questions and would just focus on using bitcoin.
Teaching them technical things about bitcoin won't work, I doubt if they would listen to you, besides their thinking capability is not as matured as an adult, they are focusing on what could make them feel satisfied like playing.