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.
Are you suggesting that the casinos should impose an age limit to the gamblers? This sounds like a good idea. Most casinos have KYC, which means that they could verify the age of their customers, which means that the senior gamblers could get blocked. I can't see how any casino would decide to limit it's revenue by blocking seniors from gambling. Maybe some countries should include such age restrictions in their gambling regulations and legislation.
I don't know at what age would I retire from gambling. I don't think that I'm going to keep gambling until I die. I will have to quit at some point, but I don't know when or how.