I'm recently diagnosed ADHD - when I got my diagnosis in February, the scores on my screening test and the results from my assessment were so high, that even my clinician commented on it.
@Dairydebris and @slatinds you would both look at me and think that I was one of the middle-aged, well functioning people you describe.
I have been with my husband since we were 17, have a family, successful career, have done well educationally and financially.
You would also see that I was disorganised, struggle to meet deadlines, am messy, forget appointments, am usually late for things, waste money on impulsive purchases, and probably think I was a chaotic slob who just needed a diary.
I know you would see that because before my diagnosis, that's what I thought about myself and I used to beat myself up daily over it.
What you won't see is that despite my intelligence and awareness of my failings, none of the techniques I've tried over the years stick which leads to crippling anxiety, stress and guilt (which in my case eventually led to 9 months off work with burnout and very nearly saw me hospitalised).
When I started to consider that I may have ADHD and look into it more, before getting my diagnosis, it was literally like someone had switched a light on. Everything in my life made sense:
-- random purchases that I have to have delivered the next day, which then sit in boxes for months and an addiction to gambling that I very nearly developed (impulsiveness)
-- forgetting to cancel subscriptions, missing appointments, forgetting tasks (lack of object permanence),
-- being late and underestimating how long things take (time-blindness)
-- taking on too much and constantly being on edge thinking I'm in trouble for something and everyone hates me (rejection sensitivity)
-- short term hobby obsession and unfinished projects, leaving things to the last minute before getting a weeks worth of work done in a few days or hours (hyperfocus / lack of focus and needing the dopamine rush of an impending deadline)
-- Struggling to make decisions leading to procrastination (decision paralysis)
-- the constant noise in my head (internalised hyperactivity)
-- super calm in a crisis when everyone else is losing it (because adrenaline and dopamine trigger hyperfocus)
Taking the medication was life-changing - my brain was quiet for the first time ever - I had space to think and work through my issues and look for ADHD friendly solutions.
Because of being able to understand why I do the things I do, alongside meds and coaching, I have started to address my issues. I'm not there yet and my med combinations still aren't quite right, but I have made some changes.
I try not to use it as an excuse, but it is a genuine reason. I am open with people about my diagnosis which helps to ask for accommodations at work or to apologise to collegaues when I've not finished something or not met a deadline (whereas I would have previously just buried my head in the sand).
Talking to other late diagnosed women is also really helpful, because it helps me realise I'm not alone.
I'm happy to answer any questions if you still have doubts - I can only answer for me and ADHD is not the same for everyone - but I more than happy to be open about my experience.