Yes, children education is the solid foundation of tomorrow leadership, and with early leaning of a new technology like the cryptocurrency, it will greatly increase the children's knowledge when they grow older. I think that teaching children cryptocurrency may not necessarily require age limit, it is even better to educate the children at that infant ages as long as they can express themselves.
Cryptocurrency is completely a computer based knowledge and if the children can learn computer at the early stage of their live, there shouldn't be age limit on children's cryptocurrency education.