After years of walking behind a mower, and now riding a sulky for a few more years, I think my knees have worn out. Every day now I limp around walking worse than most 70 year olds. I was curious to know if anyone else has developed knee problems from years of bouncing around on their sulky. It never bothered me at all until last year when I hit the age of 40. Now this year it's even worse. I have not yet seen a doctor for it, but I'm pretty sure its just an arthritic, wear and tear thang. Any tips on how to keep the knees from fallin apart before I can retire in a few more years? I guess the obvious answer is to get a rider, which I may have to do eventually. But I was hoping to hang with the walkbehinds for a while longer.