The amendments made to Sections 5-128, 5-129, 5-131, 5-137, 5-138, 5-141, 5-146, 5-154, 5-155, 5-159, 5-165, 5-169, 5-170 and 5-199 (relating to attainment of age 63) by this amendatory Act of 1989 shall be retroactive to January 1, 1988.