If a kid at age of 6 gambles, something is wrong with his parents... or maybe he doesn't have parents in the first place! And here I am not talking about is it legal or illegal, I am talking about the parents that should teach their kids some other more important things in life than gambling! I guess teaching your child about gambling can come in some period (like with all things, I think parents should teach their kids first before anyone else), but for sure not before teaching your kid about what is money, how to earn it, invest it, save it... and in the end having fun with your earnings!
I have kids, I can teach them about gambling, and I probably will one day! But before we get to that life lesson, many other lessons should be learned!