The age to join the Mexican military is 18. The amount of males in Mexico that can join the military, and are available between the ages 16-49, are 28,815,506 males and 30,363,558 females. The Mexican military is a voluntary military service, but nevertheless cadets enroll in military school starting at the age of 15 to start their journey into the military. The Mexican military cosits of the Secretariat of National Defense, Army, Mexican Air Force, Secretariat of the Navy Mexican, Navy, includes Naval Air Force, and the Mexican Naval Infantry Corps.