Age restrictions at the online casino is a controversial topic these days, because the operators of the gambling sites very pointedly claim that they are unable to effectively block different ages in all of the differing countries around the world. 
This sort of situation though is precisely what causes so many concerns and issues about the prevalence of online casino gambling . Gambling sites require players to check a box indicating that they comply with age requirements in their country of residence.
Another issue is the fact that even the law has yet to really come up with a solution to this problem. The age of the player in their place of residence is most definitely the standard to use, but what company does the enforcement fall.
This find resolution if the online casino are legalized and wholly regulated within foreign markets all over the world.