Individuals with ASD were expected to be younger, as this diagnosis has only received increased awareness in the last 15–20 years (Matson&Kozlowski, 2011). This study was conducted by Matson but put in the article by the author of the article that I read.  

 Medication usage for mental health conditions Individuals with ASD were taking medication for the highest number of mental health conditions and required the most behavior support needs, followed by individuals with ID, and individuals with DS.

Bridgewater College

* There was a research study conducted on individuals with down syndrome, autism spectrum disorder and intellectual disabilities.
 *  Individuals with down syndrome were the youngest, followed by individuals with DS, then individuals with ID. 
 * Individuals with DS were expected to be younger than individuals with ID, as individuals with DS have a slightly reduced life expectancy.

Age- ASD, ID, DS


Bush, K. L., & Tassé, M. J. (2017). Employment and choice-making for adults with intellectual disability, autism, and down syndrome. Research in Developmental Disabilities, 65, 23–34. https://doi.org/10.1016/j.ridd.2017.04.004

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