I am a 67 yr old male. I have been very active, doing a lot of hiking & climbing. For about the last year, I have been experiencing an increasing, and constant aching in my upper thigh muscles. Sometimes at night it is enough to wake me up. This seems to be accompanied by loss of leg endurance (as compared to others that I have been hiking with for several years). This is beginning to worry me some. I have an appointment for another issue coming up this week. Is this something that I should bring up with my doctor, or is part of growing old ? Kelly