We can't impart them the trading knowledge but it shouldn't be their focus. We must not require them to do trading yet and we should let them enjoy their childhood first. We can teach them but we must let them do it when they're at the right age and when they are mature enough to make concrete decisions. We know how risky trading is and it needs intellectual knowledge especially when it comes to decision-making.
I agree with what you said dude, at that age he can understand we just need to level the explanation to him based on that age. It's good if it's good to do that, as long as what's needed is for them to take the initiative to find out what bitcoin is and why it's important.
For example, I have a son who will be that age, I will show him the usage of bitcoin, I will not explain anything to him about it yet, I just want to familiarize him with how it is used and how it helps, because in this case, it is a possible to start in his mind to ask about it.