Autism / Autism Spectrum Support Group
Autism is classified as a neurodevelopmental disorder which manifests itself in markedly abnormal social interaction, communication ability, patterns of interests, and patterns of behavior. Although the specific etiology of autism is unknown, many researchers suspect that autism results from genetically mediated vulnerabilities to environmental triggers.
The dx of Autism didn't exist in the 60's, Dr's knew about it here in the states but they couldn't use it as a official dx.
I hope that you get your brother the help he needs to make both your and his life better.
Have you checked into independent living? Truthfully he doesn't sound like he needs a lot of help other than I would assume that your mom paid the bills and shopped so he may not know how to do those things. There are programs that allow for their living on their own and then having somebody work with them to see if they can handle their own finances.
Hugs and prayers going out to you ^j^