I am a healthy 52 yr old female 5'4"/ 120 lbs, non smoker, rarely drinker, no heart meds perfect cholesterol and blood pressure. No varicose veins. No kids. The last few days I have noticed on my regular walks that I have pain in the back of both legs from just above the knee to just below the knee. The first time I noticed it, it was very painful and in only one calf. Now, it's not excruciating but it's in both legs and has been there several days. This has never happened before.