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.
Age requirements differ between branches of service, but in general you must be between the ages of 17-42 with no prior service (NPS). Note: Seventeen year olds need parental consent. Or between the ages of 17 and 59 for those with prior service (PS) and are able to complete 20 years of creditable service for retirement by age 60. Take and pass the Armed Services Vocational Aptitude Battery (ASVAB) test. Pass an Armed Forces Physical Examination. Must be available for initial active duty training. Must agree to participate in an initial tour of active duty training of at least 12 weeks. Top > Types of Status in the Reserve and National Guard.