Osteoporosis is an arbitrary number that some physicians at a conference in Italy, if the NPR reporter is correct, decided to call osteoporosis. The same for osteopenia. Several studies note that a significant percentage of stress, and other, fractures occur among (mostly) women with osteopenia. But that's likely because they tend to be younger and/or more active than women with osteoporosis.

In theory anyone can get a stress fracture at any age and with healthy bones. (Hearty young athletes get them all the time.) And there are more testing options, beyond just the DEXA, that can provide more diagnostic data. So seeing a physician who has a specialty in osteoporosis prevention and treatment may be reassuring in a number of ways, including whether drug therapy is in order. [I have osteopenia but am watching bone diagnostic advances like a hawk to see which technology is going to be truly helpful in providing a comprehensive re-think of the condition.]