would be quite hard pushed to find people beyond the age of 40 who don't have some kind of physical or mental impairment that in another person would make them unable to work.
I fall into that group, and I consider myself bloody lucky to be in that group.
I'm lucky enough to have a job from which they'd struggle to fire me. If I lost that job, I would be very unlikely to find another. As it is, I want to leave, but can't because there is nowhere that I know that would be as accommodating as my current job.
Last year I had a spell of seven weeks off. I returned on a phased return. Since then I've had to have another solid week off, and a day or two off per month for about 8 months. It's only in the past 2 months that I've changed medication and it's working for me better side-effect wise. However, having changed the medication, I'm continually at risk of relapse. I had to attend therapy which meant leaving early one day a week for 20 weeks. I have to see a psychiatrist once a month, which has to happen during the school day (I can't take my kids with me), so hits work time.
I'm not exactly adored there. I'm aware I'm a crap employee (well, I'm brilliant when I'm actually there doing my job, but nobody, including me, knows whether I'll be there from day to day - like I say, it's only in the past two months that I've been vaguely reliable), I'm aware that this has a knock on effect to colleagues. I constantly wish things were different (not just because it's not nice being bipolar) but wishing isn't going to do anything, so instead its constant work just to be well enough for work. The fact that I'm well enough for work often means that I'm not well enough for the children, so they miss out.
Basically, I'm nobody's bargain, and there's no way I'll get another job with my sick record, particularly not in this economy.
Like I say, I consider myself exceptionally lucky to have a job that's flexible enough to accommodate me. I'm grateful for their work. I'm grateful that it's public sector so shit-hot on equality and diversity, so I'm protected from snide comments (I still get them, but it's comforting to know I could report them and they would be stopped. Mostly I just roll my eyes - the one time it crossed into proper bullying, I made a noise.)
I don't qualify for any kind of disability benefit. This is fine - I don't need it nearly as much as other people do, but if I lose my job, I'll be surviving on jobseekers, and unlikely to ever be out of that situation.
So yes, some disabled people are lucky enough to find work. I suspect that those of us for whom the planets align and find that there is a job that we can physically (or mentally) manage, in a workplace that will be accommodating to our needs, are in a tiny minority.