Many believe that gambling is for young people online as they need thrill and and fun. But I think that even old people can enjoy gambling. There should be any age to retire from gambling at all. One can do this activity and leisure time and thus it does not affect retirement related activities also.
Gambling should always be about fun and entertainment - so can be enjoyed well into old age. In fact people who are retired will more likely have disposable income and free time, as long as they keep a handle on their spending it can provide a little bit of joy to their day. The only exception is if you start to lose your senses, like memory or suffering from alzheimers, because at this point you've lost the capacity to think sensibly and more likely require a guardian to look after you. Besides that, there is not cut off - in fact things like bingo halls can provide a way for older generations to make friends and socialize which can be difficult to do safely when you reach a certain age.