The cut-off age to join the military varies by branch and type of service. Here are the age limits for each branch of the U.S. military as of November 2023:

• Air Force: 17-39
• Army: 17-35
• Coast Guard: 17-31
• Marine Corps: 17-28
• Navy: 17-39
• Space Force: 17-39

Its important to note that these age limits may be different for officers or for those joining the Guard or Reserve. Additionally, each branch of the military can decide its own minimum and maximum age limits. While federal law establishes the maximum military recruitment age to be 42, each service branch ultimately decides what the minimum and maximum age limits are.