What do you think could be the reasons that they are still gambling though?
It could be that they want to still engage themselves and be as active as they can and they can do it through gambling? Or somewhat of a mind exercise for them?
What I notice also is that most of this seniors could really be rich as they have a lot of people behind them, some could be their grand kids or some could be their maids. Or it could be better if they will just go and stay at home as they could be vulnerable in such places?
The reasons are found here as you have suggested. I heard that old age is sweet when you have money or alot of it that you can't finish it before death calls. If you are an old person and you have given your children the best of training and financial stand that will sustain them then you can be free to do some other things that people won't see you as old fool.
Remember, an old person will hardly be reprimanded and that means he has freedom to do what he or she chooses to. And moreover, they are also pampered. Therefore, they are allowed to do what keeps them happy. So to this extent, gambling may not be for the profit for them but as fun and recreation to keep their mind, strength and reflex active. They gamble more for fun especially those who are rich.