I had a dexa scan a few months ago that showed that I have Osteopenia at age 60. I am of good weight (not too thin and not overweight), but I am small boned and always thought that I may be at risk for osteoporosis someday. Despite eating/drinking a lot of calcium rich food and having been an avid exerciser since my youth, I still developed osteopenia. My dexa showed the ever slightest bit of a problem in my wrist and hips and my spine was fine.
I had a dexa scan performed when I was in menopause at age 47 to get a baseline and I was fine. I was not on hormone replacement therapy and therefore, pushed my doctor to order another dexa scan at 60 rather than wait until the recommended age 65. I am glad I did because I can take steps now to delay any further bone loss.
If I were to look for a doctor to go to for my problem, I would most likely pick one who deals with this quite often, like a gynecologist. The other option is to find a doctor who has special interest in this area. It could be your family physician, an internist, rheumatologist, etc. if they have and treat many patients with osteoporosis.
I am currently working with physiotherapist that I know who works with many elderly people who have osteoporosis, to develop an exercise program for me to keep my bones and muscles strong. It is pretty much what I have been doing,except that I am working out with my weights - including ankle and wrist weights.
My mother who never exercised a day in her life or even ate well developed osteoporosis. I have no idea when she developed it, but was diagnosed in her 80s. She took Boniva and had no problems. My FIL also was in his 80s and took Fosamax.
Don't know what stage of menopause you may be in, but is hormone replacement a consideration?