Can You Enlist at 17? Age Limits and Parental Consent

Yes — you can enlist at 17. But at 17 you need a parent or guardian's written consent, and each branch sets its own upper age limit. Here's what the law says, what each branch publishes, and how the ASVAB fits if you're still in high school.

What federal law says

The rule comes from 10 U.S.C. § 505. It allows original enlistments of qualified persons who are at least 17 and no more than 42 years old — and adds:

"No person under eighteen years of age may be originally enlisted without the written consent of his parent or guardian, if he has a parent or guardian entitled to his custody and control."

So at 17, a parent or guardian's written consent is required. At 18, it isn't.

What each branch publishes

The law sets the outer limits; branches can set narrower ones. From each branch's official site:

goarmy.com also notes that the Army "can lift some restrictions based on the need for certain roles" and that an age waiver may be possible. Requirements change, so confirm the current range with a recruiter for the branch you want.

The other basic requirements

Age is one requirement among several. The Army, for example, lists:

• be between 17 and 42,
• be a U.S. citizen or permanent resident with a valid Green Card,
• have a high school diploma or equivalent,
• be medically and physically fit,
• and earn a minimum score on the entrance test (the ASVAB).

goarmy.com adds that to enlist you must have a high school diploma, GED, or a plan to get one. And airforce.com notes that high school students may start their application as early as the end of their junior year.

If you're 17: the ASVAB timing

Three facts from the official ASVAB program shape the timing:

1. Scores last two years. Your scores may be used for enlistment for up to two years from the test date.
2. The school ASVAB can count. If you took the ASVAB at school through the Career Exploration Program, those scores can be used to enlist within two years, if they can be verified as yours. If your school used School Staff Testing, you'll need a short Verification Test first.
3. The first test counts for the retest calendar. The retest policy is the same whether your first test was the school version or the enlistment version: one month, one month, then six months between attempts.

So if you're 17 and planning to enlist after graduation, a test you take now can still be valid when you're ready — and a low score now starts the retest clock. Prepare before your first attempt.

The minimum score

Each branch sets its own AFQT minimum. Two that are published:

• Army: 31 (goarmy.com).
• Marine Corps: 31 or higher, or 50 or higher with a GED or nontraditional diploma (marines.com).

For what those numbers mean, see What Is a Good AFQT Score? Our free practice test gives you an AFQT estimate from the four AFQT sections, with the computer version's time limits — a practice estimate, not an official score.

ASVABIFY is a study app, not affiliated with the Department of Defense or any branch.

Quick answers

Can you join the military at 17?

Yes, with written consent from a parent or guardian. Federal law (10 U.S.C. § 505) allows enlistment from 17.

What is the maximum age to enlist?

Federal law sets 42 as the outer limit. Branches publish their own ranges: Army 17–42, Navy 17–41, Air Force under 42, Marine Corps 17–28.

Can I take the ASVAB in high school?

Yes. The ASVAB is given in schools through the Career Exploration Program, and those scores can be used to enlist for up to two years if they can be verified.

Does a parent have to sign at 18?

No. The consent requirement in federal law applies to people under 18.

Sources

• 10 U.S.C. § 505 — Cornell Law
• Requirements — goarmy.com
• How to join — goarmy.com
• Requirements to join — navy.com
• Enlistment requirements — marines.com
• Careers — airforce.com
• FAQs — officialasvab.com
• ASVAB Retest Policy — officialasvab.com