My mum had osteoporosis and therefore I was advised to have a bone scan when I was about 48 to find out if I had any sign of it. I was told that it was mild, and that I would be put on medication to stop it becoming any worse - it could not be cured, but halted - anyway, I have taken Alendronic Acid every week ever since, had no problems at all.
I was also advised that my three daughters, and my sister, should be bone-scanned when they reached their 40's to check if they had any symptoms. One daughter is borderline, and the others clear at the moment.