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> “ People who are diagnosed with ADHD at a younger age likely have parents who just don't want / know how to deal with issues.”

I have no idea where you take this opinion from or if you can back it up. From my anecdotal evidence exactly the opposite is true: kids from families who do realize there is such a thing as mental health and who care deeply about their kids - those get diagnosed. Kids from other families just get mostly slapped around and screamed at to get their shit together.