McCain bristles when it is suggested that he might lack youthful vigor. Early in the primaries, he faced a blunt question from a New Hampshire teenager. Was he worried he would get Alzheimer's disease or die in office? "I'm very active," McCain shot back. "People will judge by the vigor and enthusiasm associated with our campaign. I've out-campaigned my opponents, every race I've ever been in." He ended with a joke. "Thanks for the question, you little jerk!"

Age, health questions continue for McCain