I think getting to 50 he should be able to do whatever he wants, I know I will. That is not addicted that is just found something that entertains him. Live and let live, ask if he is happy in general if the answer is yes and you know its true then you got a winner and nothing to worry about.
Perhaps you're right that he deserve all the best in life that he can do whatever he wants to spend the rest of his remaining life span in this world. I think he just waiting for the urge to do something in life that's why he found that thing that will make him happy. When I get old I don't like to experience a sh*tness in my life rather I will explore the world than to entertain myself in gambling.
The reason I say is live and let live: I lost my Dad not so long ago and in his final years finding poker kept him mentally strong, he made friends, he used his brain, he had fun and he was never alone. (He rarely won) but had fun..To let you know that your mindset about not having shitness in your life will pay off and exploring the world is a winner. I just got back from several eye opening locations. I guess to some up in one word would be Moderation.