To join the U.S. military, the minimum age is generally 17 years old with parental consent, or 18 years old without parental consent. The maximum age varies by branch:

• Air Force: 17 to 42 years old
• Army: 17 to 35 years old
• Coast Guard: 17 to 41 years old
• Marine Corps: 17 to 28 years old
• Navy: 17 to 41 years old
• Space Force: 17 to 42 years old

Some branches may allow older applicants through waivers depending on needs and prior service

. For example, to join the Army as a regular soldier, you must be at least 16 years old (with parental consent if under 18) and typically no older than 35 for active duty, though some specialist roles may allow higher ages or waivers

. In summary:

• Minimum age: 17 with parental consent, 18 without
• Maximum age: ranges from 28 (Marine Corps) to 42 (Air Force, Space Force) depending on branch
• Waivers for age may be possible in some cases

If under the minimum age, programs like the Army Cadet Force allow youth participation from age 12 to 18

. For precise eligibility and exceptions, contacting a military recruiter is recommended.