Candidates must be at least 17 years old to join the Army reserves with parental consent. Recruits must be 18 to enlist in the Army reserves without parental consent.
The military entrance requirements vary by the branch of service, but all branches allow candidates to join at 17 with parental consent, except for the Navy reserves. Candidates must be 18 years old to be eligible to join the Navy Reserves. The maximum age entrance requirement for the reserves varies widely by service, from 29 years old with the Marine Corp to 39 years old with the Navy and Coast Guard.