Slightly different perspective: I was diagnosed as a child, but had assumed I had "mastered it" and went off meds and let it go for several years. What I've come to realize is that I've still had it, just that I've structured the parts of my life that I could around it and let other parts suffer for no real reason. That kind of fell apart (the rest of the way) when my wife had her second child and a few days before I was suppose to come back from paternity leave the my office shut down along with the rest of the world.
I had to come to terms with the fact that I had not grown out of it, I just subconsciously geared everything (my environment, the kind of work I took on and was good at, my compartmentalization) around it, and honestly not in a very healthy way.
(P.S. I just recently wrote a piece about my experience with ADHD and how it presents to me <https://aarontag.dev/2021/05/13/adhd.html>)