Bitcoin is digital currency that is being widespread almost all the continent, and some people notice the development of Bitcoin very late, and it enables some people not to invest in Bitcoin in far back 2009 and 2010. Therefore i noticed that teaching children of Bitcoin in early stage and mostly children that is up to ten years and above, inculcating the functions and the importance of Bitcoin in children will make them to develop widely with the knowledge being inculcates with them already. I think that Bitcoin is good to be known from youthful age. I have noticed that assuming so many of us notice the important of Bitcoin in time we would have all be a partial millionaire if I'm not mistaken of being a full millionaire.
Teaching children about Bitcoin is not really a bad idea, since some grown ups don't have that knowledge about Bitcoin, it would be a great idea if "we" impose it on the younger ones. But if you're doing that you know it has to do with money and some children can go to any lent just to get hold of money (by stealing too) have to be careful about that.
No knowledge is a waste, since they're children you make sure you make the teaching of Bitcoin to be as a subject like they have in their academics.
You can as well help the child by doing some research, by checking out some reputable and untrustworthy sources, it will also help them to know information that are true or false.