For the purpose of this chapter:
"Discrimination" shall mean dismissal from employment of, or refusal to employ or rehire any person because of his age, if such person has attained the age of forty (40) years and has not attained the age of seventy-five (75) years.
"Person" shall mean and include an individual, partnership, limited liability company, corporation, or association.
"Employer" shall mean and include any person in this state employing one (1) or more individuals, labor organizations, the state and all political subdivisions, boards, departments and commissions thereof, but does not include:
IC 22-9-2-1