Ask for a referral to Physical Therapy, and get guidance from them. Stretching is helpful, but it is necessary to tailor it to you - some stretches my 50 yo ortho would like me to do are too hard because my balance is not as good as it once was. But the PT showed me alternate ways of exercising the same muscles. And more than one way - some to do while lying down, others when standing.
Also, form is very important when doing PT - I am in the midst of rehab from shoulder surgery. The first PT (the boss) was mostly concerned about the number of reps. The one I prefer to see watches my form on each new exercise, and I can feel the difference when done correctly. She also emphasizes that I should rest on fatigue rather than pushing through, because getting too tired leads to sloppy form and possible reinjury.

PS my hips are nearly 20 years old, and still going strong, except when ugly bursitis rears its head. But now I know to do the stretches at least a couple times a week to keep it away.