More than 10 million Americans have osteoporosis right now, and another 44 million have early stages of it. By 2020, a full 20 percent of the U.S. population will have it. It predominantly affects people over 50. Roughly 1 in 2 women and up to 1 in 4 men will break a bone because of osteoporosis—and yet, 80 percent of older Americans who break a bone aren't tested or treated for osteoporosis. Doctors are blasé about bone health, says Dr. Farah Naz Khan, in an article for Vox. And as our population ages, the consequences of that attitude are real and significant.