Proceedings may be instituted under the provisions of this Article concerning any minor who prior to the minor’s 18th birthday has violated or attempted to violate, regardless of where the act occurred, any federal, State, county or municipal law or ordinance. Except as provided in Sections 5-125, 5-130, 5-805, and 5-810 of this Article, no minor who was under 18 years of age at the time of the alleged offense may be prosecuted under the criminal laws of this State.
     The changes made to this Section by this amendatory Act of the 98th General Assembly apply to violations or attempted violations committed on or after the effective date of this amendatory Act.