My personal opinion is that it depends upon the therapist. I think many ABA practitioners are used to working with younger kids, so I would want to find someone who had significant experience applying it to older kids. I do know someone who's son had ABA through the age of 8 or 9 with success. He was a high functioning kid. But the programs he did were nothing like what you would see a 3-4 year old doing. They used the CARD program http://www.centerforautism.com/programs.aspx
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Mom to 2 exceptional atypical kids
Long BAP lineage