Is It Illegal for Kids to Buy Stock?

It's not illegal for kids to buy stock, but their parents have to do it for them. The reason all this happens is it happens so fast that nobody sees it. We got it for a hundred and 50 dollars and forty five cents. That's what we paid for the stock. Someone's computer in one of te exchanges in new jersey was looking at it and seeing that apple was below that and ah, i can buy it cheaper  and sell it to that kid in berkeley, california, and steal a few pennies from him. I honestly don't know, or if it matters.