Gambling is prohibited by law, as is selling alcohol to teenagers, but this does not mean that teenagers do not drink alcohol. The same applies to casinos, not all casinos require verification, but a teenager needs to think about where to get money, and how to send it to the casino to start gambling. If the casino allows a teenager to play, they will also be responsible for this, so this is not only a problem for parents who have not explained to their children all the responsibility for this.
At least, if parents explain and educate about responsibility to their teenager, they will not trying to playing gambling because the risks behind gambling. Teenager will be careful when they socialize with their friends or will not do something that can makes them in trouble. While they are using the internet, they can position themselves as a good user because they will responsible with what they do. Teenager will have their experience in many things and if they can share with their parents and gets explanation for what they find, they will not take a wrong way to enjoy their life.