If you have a family history of osteoporosis, or if you have risk factors such as being female, postmenopausal, over the age of 65, eat vegan, have a history of an eating disorders, have a small body frame, or have had chemotherapy, you should consider taking action against possible osteoporosis sooner rather than later. The best time to prevent a life-threatening condition like osteoporosis is yesterday. The second best time is today. Have a bone density scan as soon as possible.