What branch do you have to be at least 35 to join?

To join the U.S. presidency, a person must be at least 35 years old. This age requirement is outlined in the U.S. Constitution, specifically in Article II, which establishes the qualifications for the office of the President. Additionally, the age requirement for the U.S. Senate is also 30 years old, but the presidency specifically mandates the higher age of 35.