ADHD in adults is somewhat new and some specialist either don't know or downplay it so keep that in mind. I'd suggest getting to the ADHD Adult specialist/clinic in the area. Depending on the country it might take short or long time to get diagnosed (for myself it took around 6 weekly 1.5h meetings, tests and family interviews), but I know this might vary depending on where you live.
I basically diagnosed her with ADHD (no specialist) we found out someone else already did before me but they never looked into it (mostly because you can barely mix meds for bipolar and adhs)
So essentially we got her a ADHS specialist who confirmed my idea and gave her ritalin.
Totally new person. It's 100% her, not 30-50% her depending on the day. They just started to even stop other medications to focus on ADHD more.
Point is: Yes it's somewhat new, and yes it likely would help a lot of people.
I too have ADD but I don't like amphetamines so often. I essentially went the way to turn my life upside down to build my own environment I enjoy to work in.
ADHD isn't necessarily "hyperactivity" neither, sometimes it doesn't show till later years or even ever. Thus there are forms such as ADD, and ADHD in girls/women manifest vastly differently.
It's genetics. Depending on the study ADHD is genetic condition with 70%+ (latest high figure I heard is 77%) chance of passing down the children and around 30% occurrence in the 2nd degree. It's also additive, meaning that if both parents have mild-moderate ADHD the child has chance to hit a neurology jackpot. Based on family story I can exactly tell who have it in my family and it spans quite long. So when for example someone smashes a window or falls and bruises often it's quite often "oh it's always been like this with boys in our family" which is another gate preventing proper diagnosis and management.
The tool's been put together with the WHO: