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VIDEO: How Do Social Behaviors Affect How We Age?  

Identical twins -- they come from around the country once a year to attend a festival of twins in Twinsburg, Ohio, just outside Cleveland.

For researchers, especially those studying how people age, having access to so many pairs of these genetic carbon copies is a scientific bonanza.

"We can compare the twins that have different social behaviors ... and see how those factors make a difference in their appearance," said Dr. Bahman Guyuron of University Hospital, Case Medical Center. Guyuron is the author of the study comparing 186 pairs of twins.

Many times there is a glaring difference reflected in the photos of twins. When comparing a pair of twin sisters, one who smokes and one who doesn't, for instance, the smoker has tiny, telltale vertical lines around her lips and longer, deeper wrinkles around her eyes.

"That's because smoking shrinks tiny blood vessels in the face so the skin is not being nourished," said Dr. Darrick Antell of St. Luke's Roosevelt Hospital and the author of one of the first twin studies. "Smoking dehydrates the skin so it's much drier."

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