Sounds like second opinion time to me. I am not sure that minor impingements (where the acebetular cap is rubbing slightly on a tendon) show on x-ray. I am aware of people who have been repeatedly fobbed of but have eventually found relief either through tendon release or further surgery to replace or reposition the cap. I am slightly younger than you (65), a lot slower than you, but it was obvious from a few weeks post surgery that I would have no problems with running other than those caused by loss of aerobic fitness before / after surgery. That has been the case.