Bitcoin is difficult to explain. I also felt difficulties in understanding bitcoin for the firs time. Let's share how to explain bitcoin to children of teenagers. In My country I can say 98% children don't know bitcoin. In fact, bitcoin can be future money. If the children not familiar with cryptocurrency or bitcoin, how can they face the digital era in the future.
I think it would be hard to teach little children about Bitcoin. It would be more effective for these little children to get exposed to Bitcoin rather than directly instruct them about it. Little children will imitate and learn from what is shown or demonstrated rather than what is taught. But to teenagers, Bitcoin teaching will be a lot easier. These are the ones that are already very much aware of the present system that we have now, and its current development. It is better if we start explaining to them that the current path the world is treading is leading to a fully digital world. They can easily relate to that. And then we go on telling them that because of this situation a digital currency is also what we need. And we have already started with it. We just need to use them.