McCain may be 71.8 years old on paper, but his biological age is a youthful 63.7, according to the physician who wrote You: The Owner's Manual. Dr. Michael Roizen made the estimate based on McCain's recently-released medical records (though some details on the candidate's dietary and exercise habits were missing). Only kink? One year in the Oval Office ages its inhabitant 2 biological years.
Two terms as president would make McCain's biological and chronological ages match up at age 80, Newsweek reports. But his healthy body mass index, relatively low blood pressure, cardiovascular health, 96-year old mother, and regular check-ups keep him young. His cancer history doesn't set him back, although his past as a smoker does by one year. (Read more medical records stories.)