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.
It is difficult to explain to them because they are not aware they have no idea to bitcoin and I think if I will explain to them what is bitcoin,it consume long time to explain to them because bitcoin very wide topic to be able to them to understand it. So I will say to them that bitcoin is a modern money and etc. I believe that the teenagers will know the bitcoin as time goes by because they are technological people .