(2) The district shall not charge a person over 65 years of age a fee of more than 50 percent of the regular fee for transportation provided by the district. The maximum fee established by this subsection does not apply on any weekday, Monday through Friday, between the hours of 5 a.m. and 9 a.m. or between the hours of 3 p.m. and 7 p.m. [1969 c.643 §26; 1973 c.474 §1; 1975 c.124 §1; 1975 c.169 §1; 1981 c.634 §1; 2003 c.14 §131]