I’ve been looking at this myself , I’ve been shooting 58# for a long time, ( I’m 66)
I just went through quite a bit of health issues and kinda freaked out thinking I wouldn’t be able to shoot my current set up. I have a close friend that’s a bowyer and makes a very nice longbow. He shoots 40@29 and shoots through several deer a year with no issues. He recommended 45# for me , so I had him build me a bow. It shoots a 520 gr arrow with authority BUT I’m having a hard time adjusting to the lighter weight and the affect on my release and anchoring. I did kill a deer earlier this year with it , with a pass through, but it wasn’t a fluid shot, I had to think about it. It made me uncomfortable learning to shoot a new bow while hunting , so I went back to my normal heavier bow and killed a 8 point a few days later with a perfect shot. I think I really should have only dropped maybe 5-6 lbs instead of 13 , or wait till summer to give me time to learn a new bow/arrow set up. In the long run the lighter bow will probably be a positive move with increased accuracy while still maintaining the ability to shoot a good hunting weight arrow.