We can't normally teach kids about bitcoin. Why? First is that they don't know the value of money. They just sit around, play around, etc. They don't have the interest for the money. All they do is to ask their parents buy their wants or may I say toys which is the things they want so bad. If you can teach them, well it's great.
I think it's not time children understand about bitcoin, yeah true, even they may find it difficult to understand fiat money let alone understand bitcoin which is obviously more complicated than fiat. Little children it's time to play, learn, and will not be able to understand in detail about bitcoin