The answer to this question is Prenomination stage of Presidential process.
Prenomination is the first stage in the process of electing a President. Prenomination is a stage where the parties choose which candidate shall represent to run for Presidency. In order to run for Presidency the following are the criteria to run as President; must be a natural born citizen of the United States, at least 35 years old, and have at least 14 years or being a resident of the United Stated of America.