I was actually going to point that out. IMO from what I've seen of parents are that people who bring their children at a young-ish age to a therapist have a different issue. Especially "being to hyper" or "being unable to focus" have a different issue.
Children are supposed to be outside moving 8-12 hours a day, have you seen puppies? They need something similar. Instead many parents give their children tablets, plop them in front of the TV and do something else. Kick them into the back yard or go throw a ball with them.
Every child I know diagnosed with ADHD had parents who didn't want to deal with them. Bringing them to the gym, to the park, playing in the backyard; it's a lot of work. Kids who have trouble focusing are likely tired and overstimulated. Reduce the number of toys, remove TV / tablets, and send them outside. It'll probably solve itself.
As an experiment, look at the people you know on medication (or ask), look at the troubled children, etc. I guarantee you'll see the same trend: single parent home, started medication at an early age, regular therapist appointments, etc. They're unhappy and need depressants, ADHD medication, etc.
It's not always the case, but it's a trend. People who are diagnosed with ADHD at a younger age likely have parents who just don't want / know how to deal with issues. Mental health "experts" treat the symptoms via medication, but the underlying issue(s) just continue to fester.
What we really need is a strong emphasis on family development, courses built around it and support groups. Parents naturally do this, but I think it's been severely broken down the past 50-60 years and is getting exponentially worse. As such we see more: single parent homes, abundance of medication, reduction in religion and adult social clubs, etc.