Games are the best way to teach kids about bitcoins. Through which they are more exposed to bitcoin.
I think it's pretty early to teach kids about bitcoin. Before teaching them about bitcoin they must learn to use the money. Bitcoin is related to the world economy, I think finding it suitable at a larger age
I think they should restrict to their nature and physical games which is more beneficial for them. I think they have nothing to do anything with bitcoin, even if they learn about bitcoin.
In terms of technology if they are not interested then it is ok but if the time came when bitcoin will be used widely everywhere and it becomes the need of the daily life then at that time we have to invite our kids to be the part of this community because then they will remain numbed from the world affairs and will not be able to take part in the businesses and financial affairs of the world.