I'll turn 52 this month, and I'm getting back into the game after playing only sparsely the past decade or so. It's been a couple of months now but I'm already seeing some improvement, shaking the rust off. The biggest difference I see is that when I started as a teenage and into my 20s I could play all day and I did. I used to go to the pool hall and play 8-10 hours straight. Now I get tired after only 3-4 hours, and as much as I'm enjoying myself, I have to call it a day. But even that is likely just a matter of physical conditioning. I'm not in the best shape at the moment. If I got more exercise, ate better, etc., I might be able to endure a longer session. Either way I plan to continue playing pool as long as I'm able.