The focus is indeed on those who are of legal age for gambling, but ultimately, we can see that with the rise of gambling, including online gambling, the notion of gambling being only for those of legal age is no longer valid, as gambling can be easily accessed by anyone, regardless of gender or age, and it is not uncommon for teenagers or those still in school to gamble.
In my current environment, there are even some middle school aged children who are still far too young to gamble, but they have already been exposed to it, which clearly raises significant concerns.
I don't think it's a problem if adults gamble, but children who are not yet ready to know about such things can clearly be disturbed in their thinking and psychology if it is not stopped.
Although those who are underage and not upto the age of gambling shouldn't be allowed to gamble and of course it would affect their mental thinking knowing too well that their age is certainly a limitations and can't handle things of gambling. But for those who are already 18 and above can likely gambling but sometimes their power to make sound decisions could be hard because they knew that primarily they aren't mentally matured and could either affect them in decisions making.
That is the problem because gambling is now very common and accessible to anyone at any time, including young children, so they will ultimately have free access to it.
They should not be allowed to do so, but with the ease of access available, it is very difficult to implement measures that explicitly prohibit children from gambling, even though there is KYC in place. However, this can be circumvented, and in practice, that is exactly what is happening now.
Sometimes, even minors who don't fully understand such matters can be influenced by their peers due to a negative environment, and it's undeniable that this is the case in my current surroundings. Some of them are even willing to gamble without spending their own money, using the excuse that it's just a game, and there are those who deceive their parents. It's heartbreaking, of course, but ultimately, it's very difficult to anticipate such situations.