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.
For me it's easy to explain it to the children or teenager because now the generation is so new they are all alert what happened on their country so for me I will explain bitcoin to their the true information and tell them that they can earn money here so that they will get curious and if they will get curious there's a possibility that they will use this and they work on it.
). Besides explaining to them, you should also teach them how to make money from it, for sure that they will be very curious and start asking more. They will also be more independent and feel more self - confident of what they making money at this age.