A disc problem in your lower back can also cause pain at any point or points from the hip on down to the foot (without your back actually hurting).
Also, are you taking a statin to lower cholesterol? Statins
are notorious for causing all sorts of muscle and joint aches
"use it or lose it" has its corollary with the fox inverse square rule of life: "as we get older, we get uglier and sicker." sometimes, it feels like an uphill battle, but it's very important to stay active.
I would discuss these symptoms with your doctor, who should be able to piece things together to find an answer for you. Good luck and feel better!