I am sure that kida are most time gambling in real life.My friends under 18 years gamble in real life casinos,real life machines,but they more bet online but they also bet in real life.
I think when you want to gamble at the casino offline. a guard or security guard will ask your age if you look young. maybe you will need some of proving such as ID cards. because the rules that gambling should have a lifespan of over 18 years. I do not really care if you have a lifespan of 18 years and play at online gambling