Each branch of the Service has different requirements. Minimum entrance-age requirements are 17 with parental consent or 18 without parental consent.
http://todaysmilitary.com/joining/entrance-requirements
In the Air Force Reserves, the maximum age is 34 years old. In the Air National Guard, the maximum age is 39 years old. In the United States Navy, the maximum age allowed to enlist and ship to basic training is 34 years old. In the Naval Reserves, the maximum age is 39 years old. In the United States Marine Corps, the maximum age allowed to enlist and ship to basic training is 29 years old.
http://www.militaryspot.com/enlist/what-is-the-maximum-age-limit-for-each-branch-of-the-military
Your FINAL option is to contact the Army Personnel Testing (APT) Program at the Human Resource Command (HRC) to schedule testing. Click here to see what documents and information are required. You can contact APT at (703) 325-9881 DSN 221-9881 or by email at apt@conus.army.mil.
http://www.usarec.army.mil/hq/warrant/WOEligibility.shtml
In the Marine Corps Reserves, the maximum age is 29 years old. In the United States Coast Guard, the maximum age allowed to enlist and ship to basic training is 27 years old.¹ In the Coast Guard Reserves, the maximum age is 39 years old.
http://www.militaryspot.com/enlist/what-is-the-maximum-age-limit-for-each-branch-of-the-military
By Andrea WalesJune 17, 2013. The Department of the Army has raised the age limit to 33 for eligible Active Component, in-service Soldiers to apply for Officer Candidate School at the upcoming July OCS selection panel. Applicants must possess baccalaureate degree or higher. The application deadline is June 21. The customary age limit of 30 for AC applicants [set forth in Army Regulation 350-51, In Service OCS Program,] reflects the old requirement that, when they become commissioned officers, those without baccalaureate degrees will pursue their bachelor's degrees to completion.
https://www.army.mil/article/105779
For this MOS you must be less than 33 years of age by the convene date of the board (or request a waiver) and have 20/50 distant visual acuity, correctable with spectacles to 20/20, also note there is an Aeromedical refractive error exception to policy (LASIK/PRK information).
http://www.usarec.army.mil/hq/warrant/WOEligibility.shtml
The prime candidate for WO has 5 - 8 years of active federal service (AFS) and meets all other prerequisites. You can apply regardless of AFS but require a waiver if you have 12 years or more of AFS. The standard for approving an AFS waiver is more stringent than for a prerequisite waiver.
http://www.usarec.army.mil/hq/warrant/WOEligibility.shtml
1 APFT must be current and not older than six months by the time the applicants packet will be boarded. 2  Pass the commissioning physical for technical specialties or the Class 1 (warrant officer candidate) flight physical for Aviators.  All applicants must have 12 months remaining on their enlistment contract.
http://www.usarec.army.mil/hq/warrant/WOEligibility.shtml
1 Active Federal Service (AFS): All applicants must have 12 years of AFS or less prior to their packet being boarded. 2  Applicants must submit an AFS waiver request with the application if they have 12 or more years of AFS.  Age Requirements: For 153A, 33rd birthday or less prior to their packet being boarded.
http://www.usarec.army.mil/hq/warrant/WOEligibility.shtml
In the United States Army, Army Reserves, and Army National Guard, the maximum age allowed to enlist and ship to basic training is 35 years old. The Army experimented for quite some time allowing anyone up to the age of 42 years old to enlist and complete basic training.
http://www.militaryspot.com/enlist/what-is-the-maximum-age-limit-for-each-branch-of-the-military
what is the age restriction on army reserves?
The age restriction on Army Reserves is 35 years. The age restriction on army reserves is 35. The restricted age on army reserves is 35 years old.