Prince Charles just can't wait to be king: 'I'll run out of time soon,' he jokes

Prince Charles is the longest-waiting heir to the throne in the history of Great Britain -- and this weekend, he joked that he's getting a little bit impatient, as he recently celebrated his 64th birthday. His mother, Queen Elizabeth, is 86 years old and in good health.

"Impatient? Me? What a thing to suggest! Yes, of course I am," the Prince joked when asked if he was getting tired of being heir apparent. "I'll run out of time soon. I shall have snuffed it if I'm not careful."

He may be waiting a while yet if genetics have anything to do with it, since Queen Elizabeth's mother lived to be 101 years old. Some pundits have suggested that Charles may cede the throne to Prince William, but Will's aides say there is "no question in his mind" that Charles will be the next King of England.