gambling to kid under 10 year old is not good
but is very bad, this brain not good learn gambling to kid
For me I think for the ages of 20yrs downwards are not good, or it is better that you if you can stay away your children to learn about gambling they cannot get addicted when the time comes that they become mature so that their children also cannot adopt it.
21 years old to be safer, in the US only with age 21 can enter in a bar so I think that is the basis for a person to be called a matured person or adult, we know that gambling is a very risky game as it involves money so it is just right not to teach that to kids.
But it is also depend of a person because some people that ages around 30 - 40, some of them doesn't even know how to control themselves when it comes in gambling and also in their financial problem. So it is also depend on how can we control ourselves.