My knee feels fine. I've been able to walk and jog with no soreness, but the knee has been slightly sore when I first get up from sitting a while. However, yesterday and today, my knee felt fine when I first got up and continued to feel fine as I walked around and as I walked/jogged at the rec center. I've been using Arnica for muscle pain, Ruta for tendon injury, and Rhus Tox for pain that decreases as I move around.
The following picture was taken from the web and is how I picture old age and running.