(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.
Well, whaddya know. I'm apparently a member of the unorganized militia .
For another year or so , at least.
 According to 10 USC § 311(b)(2), for the pedantically inclined.
 362 days, to be more exact.