The PASRR Technical Assistance Center helps states fulfill the goals of Preadmission Screening and Resident Review

Classification in Mental Retardation: Chapter 3. American Association on Mental Deficiency (AAMD), now American Association on Intellectual and Developmental Disabilities (AAIDD)

To define an intellectual disability, 42 CFR 483.102(b)(3)(i) incorporates by reference the definition in AAMD's 1983 Manual. Copies of that manual are hard to find. An scanned copy is provided here.

Page 11 indicates that a "developmental period" ends at age 18. 

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