I easily score as ADHD, but I'm in my 60s now and have never been diagnosed or treated. I have muddled through all my life. Yes, I often self-medicated unhealthily (cigarettes, various over-the-counter uppers), but also relatively healthily (I've been practicing meditation for decades). I managed to have two, long, fruitful careers (20 years of journalism, coming up to 20 years of software engineering) that (I'm betting) was at least partly attributable to me being on the outer edges of normal.
I think that's OK. I'm not looking to be "treated" because I'm a bit different.
She is also ~60 and accomplished in her professional,social and family life.
Pre-diagnosis she would reject suggestsions going into the direction of an ADHD diagnosis, due to her accomplishments being above average --> not possible to have a disability/neuro-divergence.
The achievements are her achievements, but the expense in the context of her capabilities was very high and quite taxing on her.
A diagnosis or even treatment is not making the person normal, but it can help provide that person with options to alleviate the expense of operating differently to the baseline.
I am very happy that you managed to have this success in your life so far and you made that happen.
But under your assumption that you have ADHD you might have made that happen against odds that would have been in part optional if you had access to treatment options.
Only drawback is that it's not POSIX, no issue for me, but maybe for people who have a lot of muscle memory with bash.