Hi Tiny...
I'd say go to your doctor and ask for an x-ray of your hip. If it's OA, there's lots you can do to slow it down. But it might not be your hip. Back problems often start as hip pain. In fact, there are a whole host of things that can start as hip pain.
But most likely, you are right in that it's OA. Early treatment can slow it...almost stop it. Physical therapy can restore the lost motion, medications can slow the course. sometimes, just learning how to move it differently can mean a world of difference.
So I vote for a doctor's visit!
Jenny