I think it's important to remember that just because a disability isn't severe enough to be recognised until recently, that doesn't mean it hasn't impacted a person's ability to work.
I cared for a lady who I am convinced had ND; she was definitely ADHD, at least. She would fixate on new hobbies to the point where they took up every minute of her day. When I started with working with her, she was into crochet, she was making gowns for stillborn babies and planned to learn how to make her own crochet patterns so she could make personalised memory bears and blankets and planned to get her own stall in the local hospital so she could sell her wares to raise money for charity.
Then the home allocated some of their garden to allotments for the residents to manage, and she was going to single-handedly end food poverty in the local area by growing all this amazing fruit and veg, which would be given away to locals. She even wrote out little recipe cards to go with her produce and started a petition to get chickens. I don't think she managed to grow even a single strawberry before she moved on to weight loss and chair aerobics.
When I left to go to a remote IT job, she was asking her sons to buy her a laptop so she could learn computers and get "one of those fancy online jobs". She was 87 years old and had never so much as turned on a computer.
She was an amazing woman who was very proud of the fact she'd worked since was 14 and never claimed anything until she retired, but she'd had a few careers, factory work, shop work, hairdressing, dinner lady... and finally she was a lolipop lady after she retired. I can't help wondering how much further she would have gotten in life if her disability had been recognised and she'd been given the tools and support to manage it.