I had my left hip done 2.5 years ago at age 45. I hadn’t run for 5years prior due to arthritis. I started slow and short (1 mile) 6 weeks after surgery and ramped up from there to > 40 miles a week. There were some painful moments, but it always passed. Doc says my left hip looks great. I have run enough with it to wear out the right side. Getting that replaced Friday, as I can no longer run how I want.