I think that children should learn about basic only. When they are in primary school, the amount of information they get is already huge. Math, reading, writing and etc. Few months or years all they did was playing with toys, watching cartoon, and now a stress of study hits them. Adding new (Bitcoin study) isnt good. During secondary school they are busy also. Mastering basic skills, new things they learn. Dont forget teenager transformation period. And parents came with "lets learn about Bitcoin, technology and earning" or they get a new subject at school. 100% they wont be interested in it and wont stay focused. It will be a waste of time. But when children are about to finish school, then it is a good time to learn something new. Something that might influence on their university choice and career. But such children aint children anymore.

I would not teach children Bitcoin. They are children after all. They will have childhood only once. I dont want them from very beginning of their life to start to think about "how to earn, how to get a career, where to invest, how to get money and etc". Let them enjoy their life. They have plenty of time to learn, to work in future.