I just wonder if it actually did get worse or it just seems like that because as an adult you have a lot more on your plate than you did when you were a kid/teen
I was diagnosed at 32 in my last semester of my undergrad. I just ended up with more stress than I could handle and ended up in therapy and thats when I found out.
Similar thing here. Too much stress at work and at home and suddenly things I’d always been able to do were becoming difficult. I couldn’t brute force my way into focusing anymore.
But once I got on medication (and my body adjusted to it) my brain felt like it was 20 years younger again. It was life changing, for the better.