I'm 67 and starting to develop arthritis in both knees. My right knee feels fine , but my left knee is starting to touch bone slightly on the  the inside part of my knee.
 I have  a slight bow in my left leg due to a car accident when I was 18 . 
Compound fractures in both legs from that accident  has caused a few surgeries over the years due to my love of sports. 
I've been told that I could need a knee replacement in the next few years. I'd rather go a different route if at all possible.