But as the years go by, the high-stakes decisions, constant criticisms and the fluctuating public opinion chip away at the president. His shoulders slump a little and his energy may seem sapped.

The president ages twice as fast while in office, according to a theory advanced by Dr. Michael Roizen, a chief wellness officer at the Cleveland Clinic.

“The typical person who lives one year ages one year,” he said. “The typical president ages two years for every year they are in office.”

This is what he projects Obama will look like four years from now.

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