One of them is the increased number of people caring for mental status, but the other one is, we are living in an era that requires long hours of computer usage which is against the living way of an ADHD person. We need to walk, go out, spend energy, but nowadays we have to stay in an office, look at a screen, which is so boring.
I’m reluctant to blame anything besides increased awareness for any increase in diagnosis.
I didn’t discover that I had it until I was almost 40, and I’m sure many others my age STILL don’t realize that they have it.