I don't think you're alone at all.
My lab is 12 years old and has bone cancer and will likely not make it to September, and my brother's dog is now deaf and near blind. They were both a lot of fun to take mountain grouse hunting. The lab got it right every once in a while but my brother's cocker spaniel through smell or some other sense would let you know they were in a tree nearby and was always right. He'd get real birdy and start stomping his feet and grunting. If you stopped and looked there'd be grouse roosted up within sight. One of the great predicaments of September is that upland grouse starts the same day as big game archery here in Montana, and I find myself deferring to grouse hunting more often than not.
Big Fin's phrase, "You're gonna run out of health before you run outta money," is powerful and applicable in the context of good dogs. Hunt with your dogs as much as you can.