History: 1959 act specified that discrimination based on age is unfair employment practice in Subdivs. (a), (b), (c) and (f), added exception re bona fide occupational qualification or need in Subdiv. (f) and added provision specifying when provisions of section are not applicable; 1963 act limited provision specifying when section does not apply to provisions “as to age”; 1967 act specified that discrimination based on sex is unfair employment practice in Subdivs. (a), (b), (c) and (f); P.A. 73-279 made discrimination based on physical disability including blindness an unfair employment practice in Subdivs. (a), (b), (c) and (f); P.A. 73-647 added Subdiv. (g) re termination of employment because of pregnancy as unfair employment practice; P.A. 75-350 added proviso in Subdiv. (1) of provision specifying when section does not apply re new employees' inclusion in existing retirement or pension plans and collective bargaining agreements; P.A. 75-446 made discrimination because of marital status an unfair employment practice in Subdivs. (a), (b), (c) and (f); P.A. 78-148 made discrimination because of mental retardation an unfair employment practice in Subdivs. (a), (b), (c) and (f); P.A. 78-350 revised previous provision specifying inapplicability of section to delete inapplicability re termination of employment where employee is entitled to benefits under retirement or pension plan or collective bargaining agreement and re operation of terms of retirement or pension plan or group or employee insurance plan, inserting new provisions as Subdivs. (1) to (3); P.A. 79-152 divided section into Subsecs., replacing alphabetic Subdiv. indicators with numeric indicators accordingly and adding provision in Subsec. (a)(7), formerly Subdiv. (g), re transfer of pregnant employee to