Autism Collaboration, Accountability, Research, Education, and Support Act of 2019 or the Autism CARES Act of 2019 This bill reauthorizes through FY2024 and revises several programs and activities relating to autism spectrum disorder (ASD). Among other things, the bill reauthorizes provisions relating to (1) expanded ASD research at the National Institutes of Health; (2) ASD education, early detection, and intervention activities supported by the Health Resources and Services Administration; and (3) the Interagency Autism Coordinating Committee. The bill also generally revises the scope of such programs and activities to encompass ASD individuals of all ages, rather than only youth.