Constitutional Provisions
In Article II, Section I of the Constitution, the formal requirements for the office of president are defined. The President must be:
1). A natural-born citizen of the United States.
2.) At least 35 years old.
3.) A resident of the United States for at least 14 years
preceding office.
Thanks to Franklin D. Roosevelt thinking he was the stuff and camping in the White House for an unprecedented four terms, Congress proposed the 22nd Amendment in 1951, which limits the office of president to only two terms. But, if the president is actually a vice president taking someone's place, the limit is extended to two-and-a-half terms, or ten years. This term, however, can be cut short in no time if Congress decides to whip out the ol' impeachment. If formally accused, tried, and found of wrongdoing while in office, that president can kiss his private bowling alley goodbye. If this happens to be the case, then the 25th Amendment will promptly be invoked. A crude depiction of the 25th is provided below.