It is all down to just where in the world an online casino site has chosen to get licensed and regulated as to the unique set of laws that they are going to have to abide by, however please do be aware that some casinos sites you come across online are not licensed or regulated.
Some companies that do operate and run gambling site include both online and mobile casino sites and apps will simply choose to obtain a business license in some third world countries and will try and pass that license off as a gambling or gaming license.
If you make the mistake of gambling at such a casino site then you are going to be exposing yourself to all manner of risks including you not having the peace of mind or any guarantees that the games you are playing are completely fair and random.
In fact, many unlicensed casino sites have mastered the very evil art of finding any excuse under the sun not to pay out their winning players, and as such you really do owe it to yourself to stick to gambling only at online casinos that do hold a full and valid gambling licence and not simply a business or trading license!
Minimum Age Requirements
Much like you are not going to be allowed into or to gamble at a land based casino site if you are not old enough to enter such venues and premises, you will also find the same rules and laws in place in regarding to both online and mobile casino sites too.
The minimum legal age to gamble on any online casino site is always going to be displayed prominently on their website, and the actual minimum age to gamble at each online or mobile casino site will be dependent on the countries each of their customer are based in too.
Know Your Customer Requirements
I am pleased to say that many online casino sites have now done away with the need for their newly signed up and registered customers having to send into them copies of their identification documents, which is always good to know.
What those sites will do however is to verify your identity electronically and they will always let you know if and when you accounts have been fully verified and when they have been you can then play with no limits in place eon your account other than the ones that you may have put into place via the gambling limit option settings most casino sites now offer their customers!