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 also feel the same way but children doesn't have to know this for the meantime since all they know were about to play etc. As for teenager, I think it might be a good idea since these people were inclined to techonologies and besides they were mature enough to understand this. If we were having a hard time to explain this on them, then let's make them believe us by using proof on what or how they can get earn money through hard works of posting, joining in campaigns etc so that they there might be the possibility they will become interested.