I Have Been Very Active All My Life And Now,

I have been very active all my life and now, at 73, when I'm out walking I get pains in my legs and groin area. I now find I have difficulty putting on my tights as I don't seem to be able to bend down like a used to just a few month's ago. I am very active and was an aerobic instructor, did running and went to the gym three times a week.