children doesn't need to know about currency,but teenagers does,and i think there's so many explanation video in youtube so don't wasting effort wasting your time when you can just give them about the link of video so they can learn from it,whether they will be interested or not,it's definitely depend on them
You have a point there's no reason for children to know about bitcoin because they all know is to play. But teenagers are different from childen, teenagers are more matured and they have much experience. Teenagers also have expenses to prioritize so that they need to know about it. You don't need to explain to them how it works because there are many videos in youtube about bitcoin.
For a teenager there is a very great incentive to study bitcoin, this is a real prospect of financial independence from parents. Now teenagers and so very much use the Internet for earnings, and bitcoin will increase their chances of success.