There is no way to know in advance when a gambler will stop gambling or when it will start. Because the gambler can only quit gambling when he feels that he should quit gambling. I have seen many people who want to quit gambling and then go back to gambling. But when a person gets older, he should definitely give up gambling. Because it has various effect. If one takes to gambling in old age, any major loss can lead to physical complications. We should stop gambling after a certain age. I think people in their 60-70 years should stay away from gambling. If that is not possible then it would be better to come out slowly.
It really depends on the level of self-control of each person has I do not think there is anything wrong with an old person playing some hands of poker with their friends or making a friendly sport bet with them as well, however if we are talking about unhealthy gambling habits then they should definitely quit as soon as possible, as someone that is young at least has the chance to eventually recover all the money they have lost through their hard work and investments, but someone that has reached that age does not have the time to recover all the money they could potentially lose if they are not careful.