School age is the period of a child's life from the earliest admission age to a school district's kindergarten program until graduation from high school or the end of the school term in which a student reaches the age of 21 years, whichever occurs first.
22 Pa. Code § 11.12
The provisions of this § 11.12 amended under section 1317(a) of The Administrative Code of 1929 (71 P.S. § 367(a)) (Repealed); and sections 1327, 1330, 1372, 1511 and 2603-B of the Public School Code of 1949 (24 P.S. §§ 13-1327, 13-1330, 13-1372, 15-1511 and 26-2603-B).
This section cited in 22 Pa. Code § 16.1 (relating to definitions).