Crypto world difficult for adults to comprehend how much more kids! well they may be able to do better because they have no responsibilities like the adults. But sincerely crypto is hard work and I dont recommend it for children below 18 years
You underestimate "children". I think a lot of children over 10 or so probably are capable of understanding cryptocurrency better than a lot of adults. Much like children are more capable of learning new languages than adults, I think it is a wise move to prepare them for this future, and they are more than capable.
I think there may also be a market for cryptocurrencies regarding communication and identification regarding their children's safety. Safeguarding personal information is a simple example.