The social condition or age can influence the mental of the gamblers. So, it still has a role if someone becomes addiction. Moreover they are still students, students mostly get the money from the parents. So when they lose money in gambling, they may not regret it because they can ask the money again from their parents. This condition leads them to excessive gambling, then it will be one step to be addiction.
Even though money is not a problem, being into gambling at their young age will certainly influence their minds and badly affect their studies. And the role of the parents is not just to provide the needs of their kids, but also to guide them in the right direction.
Just imagine that even those gamblers who are of the right age still suffer difficulties in controlling themselves. How much more for these kids who are dependent on their parents? It is not about caring for them not fall into addiction, but we care about their future.