I'm about the same age and also had RTKR just a few days after you on May 17th. I thought I was doing well, but I'm impressed with your recovery! I'm off the prescription painkillers, too, but still need the crutches for the most part. Whenever I try a bit without them I'm a bit unsteady which makes me nervous. I feel like I can work on my gait better with the crutches.
I also just came inside from repotting a bunch of seedlings into containers, but I'm soooo tired! Sitting here icing my knee and drinking hot tea to warm up (it's rainy and cold here, of course that's when I decide to sit outside repotting, ha ha!).
So glad to hear of your great recovery! I'm having the left knee done this fall, and my fingers are crossed that it will go as well as the right one! It's nice to hear about your smooth recovery, too.