It is not a guarantee that their old age will stop gambling, because gambling does not require energy to do it. So, when those who are old and still have capital or money, then of course they will still be able to gamble at an old age. Because the point is,age will not be a guarantee for anyone to stop, because those who stop gambling are not because of age but they have other reasons that strengthen themselves to stop or continue gambling. After all, gambling itself can start at a young age and also, many young people who previously gambled but they chose to stop quickly. So, age is not a reason for them to stop gambling, but another reason that will make them really stop gambling completely.
I probably think it's not about their strength or weakness because gambling does not require physical strength. It's all about their mental state and financial state. Those with high responsibility tend to attend to many problems when they are again. It could be family, friends, business, and their investment with companies. They wont have the time and finance to spare for gambling unless they do not want to build a good family. No doubt age is not a barrier or hindrance to those who want to gamble. But at some certain stage in life, a man tends to have a different view or perspective about something. And that has to do with age/maturity alone.