I suffered knees injuries in both knees from a ski accident when I was 12. After the age of 30, I began to suffer in cold and wet weather and sometimes the pain would almost knock me out. But the doctors did not offer any solutions nor seem much perturbed by it. By the time I was 45, I was stiffening up after sitting for long stretches and I would wake up almost immobile in the mornings, hobbling along until my body would warm up. At this point, I was diagnosed with osteoarthritis and given a knee brace and told to take pain medication and that's it!
By my mid 50s I was starting to do less - could no longer dance, run, or walk for long distances. I was told I was a candidate for knee replacement surgery, but to delay it as long as possible since there are new improvements all the time. I still travelled freely, taking lots of pain meds with me and doing much less than I was used to doing.
I even went woofing (working as a volunteer on an organic farm) after telling my host that I was 60 and had stiff knees. He was not put off by that and I ended up quite good at grazing the sheep and goats (lots of time to rest).
Suddenly last summer, my arthritis got so bad that I could barely stand or move. Travel seemed a thing of the past. Then I heard of APOStherapy (see below) and it saved my life - without surgery, I am back to a reasonable level of functioning. I no longer take pain medication every day, but I have to be careful how much walking I do each day so as not to be unable to move the next day. I only occasionally get stiff knees when sitting for long times, but I still cannot dance.
Everyone is different and you use what you know about yourself to make your travel do-able and enjoyable.