HE CERTAINLY LOOKED LIKE HE'S AGING QUICKLY AT THAT PRESIDENTS' LUNCH:

Advice to Obama on battling presidential aging (Madison Park, 1/08/09, CNN)

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."

Using public information, Roizen looked through medical records of previous presidents back to Theodore Roosevelt. Assessing factors such as diet, blood pressure, physical activity and lifestyle habits, he calculated that the leader of the free world ages more quickly.

Roizen, who is the author of "RealAge: Are You as Young as You Can Be?" has not assessed the "real age" of President-elect Barack Obama, who is 47, because of lack of medical data.

"Barack Obama is a fairly young guy and doesn't have great of a risk," Roizen said. "If he's president for eight years, he ends up having the risk of disability or dying, like someone who is 16 years older."