This is spot on. APA and their handicap system needs players of all skill levels. You will see players much better than you, of your skill level and likely well below your skill level.
If your asking if you can get good at that age, I’d say yes. You will probably never be a world champion, but I see no reason why you cannot become a “good player.” Finding other good players to mentor and play with will drastically reduce that learning curve. Don’t be afraid to ask, people generally like helping others learn the game. Take your beatings, then ask why they did “x”, or what would they have done on a certain shot. Learn from them.
I’m in my mid 30’s. As APA standards go, I was maxed out in both 8/9 ball on handicap when I stopped playing. I got into other hobbies and basically took a 9 year break where I didn’t touch a cue or visit this site. I recently got interested again and in 2-3 weeks I’m pretty close to where I left off. At least I feel like it, maybe not match play but my skills/ball making feels real similar. Some of that is there are so many good instructional videos/YouTube etc, that I kind of cleaned up some bad habits just watching them.
and most importantly have fun. Enjoy the learning process and don’t become overly frustrated as you go.