We can't stop younger ones from gambling, adults can gamble but kids should not be allowed to gamble because they do not have the idea to be able to tell between when they are having fun or getting addicted. A kid will keep gambling and lose all the money he has without being able to stop himself but an adult can have the strength to stop when he is not making any progress. Gambling is beyond addictive and causes alot of damage to anyone who is abusing it and younger ones would not know that they are abusing gambling when they are doing it. Young ones looking for money through gambling do not get it but they will keep losing the money they have thinking that one day they can be lucky. Younger ones should be enjoying their childhood and not suffering looking for money when they should be in school learning more benefiting things.
Stopping someone from gambling is almost impossible to do and for those who have not yet reached adulthood, of course it will be very detrimental if they become addicted to gambling because they do not have income that they can use for gambling so they will be more inclined to do things that are detrimental to people. Another is when they want to gamble and for those who are adults, of course they will be able to easily manage their gambling desires and also they already have funds that they can use to gamble if they really want to gamble.
For those who have not yet reached the age where they can gamble, of course they would be better off thinking about things that can make them better first and thinking about education is certainly better for them than thinking about things that are not useful for them.
Yes, that is what is worried about when a minor is involved in gambling, where as you said, stopping addiction is a very difficult action to take, where this situation can really threaten his future and make him someone who has a bad personality when he grows up, and yes it is also true as you said that someone who is still underage doesn't have an income because they don't have time to work yet which situation can lead to some bad actions such as stealing to get money that will he uses it to fulfill his gambling habit which, as you said, can harm many people.
On the other hand, older people may find it quite easy to gamble because they have personal income, but I can't say that they will be able to manage their gambling activities well, or what this means is that they have income but it doesn't necessarily mean they can manage their finances well and we can see that it is not uncommon for adult gamblers to end up experiencing negative impacts such as losing large amounts of money, and yes, according to what you suggest, for those who are still minors, it is better to just focus on dedicating themselves to the various lessons that they should do. by a child of that age, but it is actually difficult to forbid them to really avoid gambling and this is why parents must always look after and direct their children towards all positive things.