Yes there is a minimum age. If you want to play on a gambling site. You must be at least 18 years old. In short, you are not old enough yet. Then you shouldn't play yet. You do this secretly, and you lie about your age when you register. Then the gambling company will find out soon enough. Because if you win a prize and you want to pay it out. Then you will have to provide data to prove that you are who you say you are.