I think someone could create a game about it , a game composed of story telling which as they progress they get to know more about different angles of bitcoin world which could be useful when they grew up
At first, it is difficult for me to learn bitcoin. So I think, it is not suitable to teach bitcoin to a very young age child.
I do not think that not is hard to learn or to teach about bitcoin to someone. It all depend on the method of teaching and on the method of learning. If a proper method for learning is adopted then anyone can easily learn about it. Other point is that bitcoin is a much interesting currency and if someone will know a little bit about it they will start to study more about it.