My DM (now deceased)and her elderly neighbours considered themselves better off than they'd ever been - living in housing assoc bungalow's for the elderly and having their pension and, usually a bit of deceased husband's small pension and some got disability allowance. Compared to their earlier life on a their DH's low workman's wage they were/are very comfortable!
Also, everyone left school at 14 when these oldies were young and went straight into a job so it wasn't seen as a hardship in particular. They were luckier than many kids today with no jobs. Life doesn't seem so hard if it is the same life for everyone in your circle.
But I think that there is an anomoly which could be corrected, unless I misunderstand it. I had a neighbour who was on disablilty and mobility allowance (though could walk the dog slowly) who recently reached retirement age. Apparently that allowance, if you are receiving it before you reach pensionable age continues until death.
Also met another pensioner recently (who can do cartwheels, by the way) who also still gets a disability allowance plus her pension.
If you become eligible for disability allowance after the pension age you are not entitled to it, only if it happens before
So it seems unreasonable that those on it stay on it forever.
Perhaps these receivers are or have been checked recently as being eligible, I wouldn't ask so don't know. But if they haven't been this seems an unfair arrangement. I can't see why you need it only if you had the problem before 60 but not after.
By all means correct me if I have this wrong.