age or developmentally-appropriate
(11) (A) The term “age or developmentally-appropriate” means— (i) activities or items that are generally accepted as suitable for children of the same chronological age or level of maturity or that are determined to be developmentally-appropriate for a child, based on the development of cognitive, emotional, physical, and behavioral capacities that are typical for an age or age group; and (ii) in the case of a specific child, activities or items that are suitable for the child based on the developmental stages attained by the child with respect to the cognitive, emotional, physical, and behavioral capacities of the child. (B) In the event that any age-related activities have implications relative to the academic curriculum of a child, nothing in this part or part B shall be construed to authorize an officer or employee of the Federal Government to mandate, direct, or control a State or local educational agency, or the specific instructional content, academic achievement standards and assessments, curriculum, or program of instruction of a school.