Gambling is for adults, and it is expected that you should know what you're getting yourself involved in before you even start gambling. Games in the casinos been designed for you to lose and for the casino to win, but it still does not mean there are no huge winners every now and then from the same casino.
Sometimes from some of these games, if you believe that you're never going to win, then you will never ever win. But if you believe that yes, it is possible for you to win, then the chances of you winning become higher automatically based on your belief and mindset.
It's definitely a game for responsible adults, not just adults. It's a form of entertainment that assumes you're old enough and responsible enough to know when to stop and not gamble away your entire salary, causing problems for your family.