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§246. Militia: composition and classes

(a) The militia of the United States consists of all able-bodied males at least 17 years of age and, except as provided in section 313 of title 32, under 45 years of age who are, or who have made a declaration of intention to become, citizens of the United States and of female citizens of the United States who are members of the National Guard.

(b) The classes of the militia are—

(1) the organized militia, which consists of the National Guard and the Naval Militia; and

(2) the unorganized militia, which consists of the members of the militia who are not members of the National Guard or the Naval Militia

§247. Militia duty: exemptions

(a) The following persons are exempt from militia duty:

(1) The Vice President.

(2) The judicial and executive officers of the United States, the several States, the Commonwealth of Puerto Rico, Guam, and the Virgin Islands.

(3) Members of the armed forces, except members who are not on active duty.

(4) Customhouse clerks.

(5) Persons employed by the United States in the transmission of mail.

(6) Workmen employed in armories, arsenals, and naval shipyards of the United States.

(7) Pilots on navigable waters.

(8) Mariners in the sea service of a citizen of, or a merchant in, the United States.

(b) A person who claims exemption because of religious belief is exempt from militia duty in a combatant capacity, if the conscientious holding of that belief is established under such regulations as the President may prescribe. However, such a person is not exempt from militia duty that the President determines to be noncombatant.

32 U.S.C. § 313 - U.S. Code - Unannotated Title 32. National Guard § 313. Appointments and enlistments:  age limitations

(a)  To be eligible for original enlistment in the National Guard, a person must be at least 17 years of age and under 45, or under 64 years of age and a former member of the Regular Army, Regular Navy, Regular Air Force, or Regular Marine Corps.  To be eligible for reenlistment, a person must be under 64 years of age.

(b)  To be eligible for appointment as an officer of the National Guard, a person must–

(1)  be a citizen of the United States;  and

(2)  be at least 18 years of age and under 64

https://www.law.cornell.edu/uscode/text/10/246#

https://codes.findlaw.com/us/title-32-national-guard/32-usc-sect-313.html

>>15026784

On April 19, 1775, British forces were returning to Boston from the Battles of Lexington and Concord, the opening engagements of the war. On their march they were continually shot at by American militiamen.

Whittemore was in his fields when he spotted an approaching British relief brigade under Earl Percy, sent to assist the retreat. Whittemore loaded his musket and ambushed the British Grenadiers of the 47th Regiment of Foot from behind a nearby stone wall, killing one soldier. He then drew his dueling pistols, killed a second grenadier and mortally wounded a third. By the time Whittemore had fired his third shot, a British detachment had reached his position; Whittemore drew his sword and attacked.[7] He was subsequently shot in the face, bayoneted numerous times, and left for dead in a pool of blood. He was found by colonial forces, trying to load his musket to resume the fight. He was taken to Dr. Cotton Tufts of Medford, who perceived no hope for his survival. However, Whittemore recovered and lived another 18 years until dying of natural causes at the age of 96.