Well, I have for the last 3 years had problem with my left knee. I originally overextended my knee on a decline and it has never healed up right. In the late winter and spring, it is the worse from heavy boots and uneven, icy terrain. The summer it generally is not too bad but then it comes around again like clockwork in the winter. My chiropractor said I should use an exercise bike, which that is on order, and to keep exercising it. The knee hates hills and stairs. I am only 36 too! My condo is all stairs... Anyone out there with knee problems? How do you deal with yours? This is getting old quick. Thanks!