Instead of teaching them why not just let them be aware of bitcoin, letting them grow with the environment where the kid/children constantly see/hear/experience/use bitcoin it will be normal for the child about the existence of bitcoin it will be
easier for them to learn bitcoin as they grow up as they are already familiar with the currency and how to use it.
yes kids should grow in their natural environment. i think children do not need to learn about bitcoin. they should only take interest in their education, because they do not have any concern with bitcoin. and when their time will come only then they should start learning bitcoin.