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.
There are two ages for active duty in the military. The first is  the enlistment age which is 35 in the Army, 27 in the Air Force, 34  in the Navy, 28 in the Marines and 27 â¦for the Coast Guard. Once a  person is enlisted the maximum age for an active duty person is 59  for all branches of the military.