As a parent, I understand your fear because of the many outcomes of gambling we have seen people under go. Personally, I don't want to see my child gamble when he is 18th, online opinions can say what they like but it's my choice because an 18 years old should be facing his education and how to build his future to a greater height, starting a life of casino would probably be attention taken to him, I will only allow him bet when he is making money and responsibles for taking care of himself.
He will also be gambling only if he knows how to gamble responsibly, I'm afraid to see what happened to addicted gambles happening to my own child. I see how some people has moved from somebody to nothing and that's because of reckless gambling with any money they see whether it's their own or it's the money entrusted for them to help keep.
Base on our country no countryman will allow his son to gambling at any time (whether at early age or later) yet the son may take part on any gamble without the concern of his parents or disobeying his parents. If there is any parents who allow that means the parents doesn't know or the son doesn't obey his parents.