The President is both the head of state and head of government of the United States of America, and Commander-in-Chief of the armed forces. Under Article II of the Constitution, the President is responsible for the execution and enforcement of the laws created by Congress.
You can join some branches of the United States military at the age of 38 years but not others. The Army, Navy, Air Force, Marine Corps and Coast Guard each has its own minimum and maximum age requirements for enlistees, including for new recruits in the active-duty ranks, the Reserves and the National Guard.
Confidence votes 1.3K. As of right now for a person who is Non-prior Service (never enlisted in any branch of service) the Army's cut off age is 42. However the age is set at 42 years old but the individual must leave for Basic Combat Training prior to the 42 Birthday.