The director of developmental disabilities shall adopt rules in accordance with Chapter 119. of the Revised Code to do both of the following:
(A) Define "developmental delay";
(B) For the purpose of division (Q)(4)(c) of section 5123.01 and division (F)(4)(c) of section 5126.01 of the Revised Code, specify how to determine whether a person six years of age or older has a substantial functional limitation in a major life activity as appropriate for the person's age.