spongesored study of postmenopausal women that contends that just by looking at the wrinkles on the surface of your face, a doctor can see what is happening beneath the skin. in your bones. >> going to look at the wrinkles in between your eyes. >> reporter: you are kind of lucky, though, right, you don't have any wrinkles. overtanning or cosmetic surgery and botox won't alter the link. the yale study measures natural wrinkles only and says the deeper they are on a scale of one to six the bigger the chance of bone disease a direct link between aging skin and aging skeleton. >> they have the same collagen, so when the collagen breaks down and you lose bone density, the collagen in the skin, which we can see, breaks down also and causes wrinkling and other changes in the skin thickness. >> reporter: an important discovery that could eliminate the need for expensive across-the-board bone density testing which can cost $350 a patient. instead, postmenopausal women between ages 45 and 58 with heavy wrinkles would be identified as high risk by their doctors with the naked eye. >> it tells them that those people who have a fair amount of