I'll be 51 in less than two weeks and I feel like my days of being able to ramble the woods with a climber on my back for distances are certainly numbered. One game changer has been putting the Molle kidney belt on my climber to keep the weight more into your waist rather than your back. I also keep a small-sized backpack with my little items in the V of my climber with a mini bungee strap to keep it held in.
If ground hunting, I'll bring a turkey lounger that has a carry strap and I'll have my Badlands backpack, with kidney belt, that employs a rear carry so I can carry my rifle on my backpack.