Maybe as an old person, that's the way they could be entertained?
I think aged people gamble for fun too. At their age, there may physically strong to engage in other activities. Gambling can be their way of reconnecting with their youth, make new friends of similar age and interests, and just relax.
Some people might think an age gambler is giving signs of a gambling addict but for me I see it as a way of enjoying senior years and even extending their lifespan because when they come around these places and play games it's a form of exercise and it can help keep their body active. Since gambling for profit at senior age can give them heart attack when the game cuts, their frequent visit means they are coming for fun and enjoy being in the casino house.