Discover how to join the military at 40 with our expert guide. Explore five viable paths to enlistment, including National Guard and Reserve options, Officer Candidate School, and more. Learn about age waivers, fitness requirements, and career opportunities for 40-year-old enlistees. Start your military career today!
Many people assume that joining the military is only for young adults, but the reality is that it's possible to join the military at 40 or even older. While there are some age restrictions and limitations, many branches of the military offer opportunities for individuals to serve their country in various capacities. Here are five ways to join the military at 40:

Why Join the Military at 40?
Before we dive into the ways to join the military at 40, let's talk about why someone might want to do so. Joining the military can be a rewarding and challenging experience, offering opportunities for personal growth, education, and career advancement. Additionally, serving in the military can provide a sense of purpose and fulfillment, as well as a chance to serve one's country.
1. Enlist in the Army National Guard or Reserve
The Army National Guard and Reserve are two great options for individuals who want to join the military at 40. Both offer part-time service, which means you'll serve one weekend a month and two weeks a year. This can be a great option for those who have family or work commitments.
To enlist in the Army National Guard or Reserve, you'll need to meet certain requirements, including:
- Being a U.S. citizen
- Being between the ages of 17 and 42 (with some exceptions for prior service members)
- Meeting certain medical and physical standards
- Scoring well on the Armed Services Vocational Aptitude Battery (ASVAB) test

2. Join the Air National Guard or Reserve
Similar to the Army National Guard and Reserve, the Air National Guard and Reserve offer part-time service opportunities. As a member of the Air National Guard or Reserve, you'll serve one weekend a month and two weeks a year.
To join the Air National Guard or Reserve, you'll need to meet certain requirements, including:
- Being a U.S. citizen
- Being between the ages of 17 and 40 (with some exceptions for prior service members)
- Meeting certain medical and physical standards
- Scoring well on the ASVAB test

3. Become a Military Officer
If you have a bachelor's degree or higher, you may be eligible to become a military officer. The military offers several officer training programs, including Officer Candidate School (OCS) and the Reserve Officers' Training Corps (ROTC).
To become a military officer, you'll need to meet certain requirements, including:
- Being a U.S. citizen
- Being between the ages of 17 and 42 (with some exceptions for prior service members)
- Having a bachelor's degree or higher
- Meeting certain medical and physical standards
- Scoring well on the ASVAB test

4. Join the Coast Guard Reserve
The Coast Guard Reserve is another option for individuals who want to join the military at 40. As a member of the Coast Guard Reserve, you'll serve one weekend a month and two weeks a year.
To join the Coast Guard Reserve, you'll need to meet certain requirements, including:
- Being a U.S. citizen
- Being between the ages of 17 and 40 (with some exceptions for prior service members)
- Meeting certain medical and physical standards
- Scoring well on the ASVAB test

5. Join the Navy Reserve
The Navy Reserve is another option for individuals who want to join the military at 40. As a member of the Navy Reserve, you'll serve one weekend a month and two weeks a year.
To join the Navy Reserve, you'll need to meet certain requirements, including:
- Being a U.S. citizen
- Being between the ages of 17 and 40 (with some exceptions for prior service members)
- Meeting certain medical and physical standards
- Scoring well on the ASVAB test

Gallery of Military Service at 40
Military Service at 40 Image Gallery










Get Ready to Serve
Joining the military at 40 requires careful consideration and preparation. Make sure you meet the eligibility requirements, research the different branches and opportunities, and prepare yourself physically and mentally for the challenges of military service. With the right mindset and preparation, you can successfully join the military at 40 and start a new chapter in your life.