What are the informal qualifications to be president

Explanation:

 Must be 35 years old

 Teddy Roosevelt is the youngest to be sworn in, at 42.

 Must be a Natural Born Citizen

 This means you must be born an American Citizen.

 People who became American citizens by immigrating, cannot be President.

 Time in the U.S.

 As a natural born citizen, one must have lived in the U.S. for at least 14 years to qualify

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