Bitcoin is hard to explain. I also experienced difficulties in understanding bitcoin for the first time. Let's share how to explain bitcoin to children of teenagers. In my country, I can say that 98% of children do not know bitcoin. In fact, bitcoin can be future money. If children are not familiar with cryptocurrency or bitcoin, how they might face the digital age in the future.
Yes, bitcoin is hard to explain to the children because children will not easily catch up what is bitcoin for the first time, because out of the blue you will teach some kids about bitcoin. I think that you must tell the children that you will teach them about bitcoin and about cryptocurrency, i think that they will understand it more when it's have many session, or you will teach the kids part by part. Yes, i strongly agree with you that bitcoin is the future money and children must know what is cryptocurrency.