The Constitution says: No person shall be elected to the office of the President more than twice, and no person who has held the office of President, or acted as President, for more than two years of a term to which some other person was elected President shall be elected to the office of the President more than once.
S'far as I can tell, the Constitution does NOT limit the number of times an individual can serve as president, only the number of times an individual can be elected.
What if, say, however unlikely it may be, that George W. Bush were to agree to run for VICE president, and Dick Cheney to run for president on the same ticket, with the understanding that, after serving one day, Cheney would agree to resign the presidency. If you don't like those two names - fit in anybody you like, as long as the one running for president has not already served two terms and the one running for Vice President has already served two terms.
Would anything prohibit George W. Bush from serving as president for the next 4 years? I am not asking about the politics of the matter or even the practicality. Just whether it would be constitutional.