My dad had bypass surgery 14 years ago, and he wasn't a particularly young feller then. Got a call from him and mom just the other day. They're up in the smokies with their camper trailer, surrounded by the mountains they love, and the friends they love, doing what they love, which is sitting around the campfire swapping yarns and playing bluegrass music. They sounded as full of joy as a couple of teenagers.
There's more to a heart than just a muscle that pumps blood. You've got a good one Dick, and the docs may need to do a bit of "mechanical work", but you've got the rest covered. Best prayers for a smooth operation and a speedy recovery.
Sarge