Except as otherwise provided by law, compulsory school age refers to the period of a child's life from the time the child enters school (which may be no later than at the age of 6 years), until the age of 18 or graduation from a high school, whichever occurs first.
22 Pa. Code § 11.13
The provisions of this §11.13 amended under section 1317(a) of The Administrative Code of 1929 (71 P.S. § 367(a)) (Repealed); and sections 1326, 1327, 1330, 1372, 1511, 2103(8), 2603-B and 2604-B(b)(2)(v) of the Public School Code of 1949 (24 P.S. §§ 13-1326, 13-1327, 13-1330, 13-1372, 15-1511, 21-2103(8), 26-2603-B and 26-2604-B(b)(2)(v)).