I was diagnosed at 32. And tbh it made it easier to forgive myself for all the things that are very clearly signs of ADHD. eg. forgetting peoples' names, only absorbing maybe half of what I was verbally told, procrastination, fidgeting, impulsivity etc. For all those years I was treated badly by other people because of it and now I know I wasn't a bad person like people intentionally or unintentionally lead me to believe. I did the best that I could with what I had.