http://www.healthfinder.gov/prevention/ViewTopic.aspx?topicID=28
National Health Information Center, U.S. Department of Health and Human Services
Anyone can get osteoporosis, but it’s most common in older women. The older you are, the greater your risk of osteoporosis. One out of every two (1 in 2) women and one in four (1 in 4) men over the age of 50 will break a bone in their lifetime because of osteoporosis.