I watched a lot of interviews with people who were interested in sports betting. And I realized that addiction is as strong as possible when the player is young. And the younger he is, the worse his affairs can be with addiction.
This is easily explained by the fact that at school or student age, young people have no money at all. And betting for them is a great way to get a lot of money and become successful in the eyes of their peers. Who do not yet have an education and cannot earn skilled labor. And of course, for these young people, the feeling that they are successful with others, that they will allow themselves to buy the best things and phones - it is detrimental to their psyche.
They don't realize at a young age that their success is just luck. And tomorrow they can lose everything.
There are a lot of such traps in life and they are probably necessary for people to gain experience and no longer do it (those who are able to draw the right conclusions). For example, in my country (or, let's say, the information space of my country), along with gambling advertising, there are a lot of advertisements both outright scams (such as "forex trading" although there is no any forex there) and around scams like trading courses, scalping, etc. . All of them promise mountains of gold and involve people in their networks, and it is natural that some young people believe in this.
It is the major reason why underaged are restricted from gambling, mostly because their brain is under developed and cant really handle the emotional stress that come with losing money through gambling, Adult have experiences and can easily deal with their losses, but for the underaged, since they have no other way of earning money, they try all the could with gambling, they have no other thing in mind aside winning, and when they lose, they end up chasing their losses hoping they win and recover all that they have lost, if they realize what is going on, gambling have become something they cant do without, this is to say that, and also agree with you that underaged gambler are the most vulnerable when it comes to getting addicted to gambling, this is why we as parent must always endeavor to keep our children out of gambling at least, until they are above 20 or even higher .