My parents both died before retirement, which frankly was the best financial planning they ever did. (We had about enough ti cover the funerals, that was it.)
But neither was on a huge income before death, so they wouldn't have been well off in retirement.
I have mostly worked in IT, and I think I'll be okay, though I still rent in my 50s. I won't be retiring early - but that's what a friend thought who can't work after a traffic accident in his 50s and the resulting injury, or another friend whose degenerative blindness worsened to the point he couldn't work in his career any more. They didn't have the choice.
I have friends who have been contractors. Some make sure they put a good chunk of their income aside for pension and the times between contracts, and they'll be fine.
But I've one friend, he's been a contractor most of his career, now early 60s. He's had 6 figure earnings most years since his 30s. He has no pension. He's currently renting a 6 bedroom place for himself and his cat. No house of his own since divorce. But he stands to inherit a lot from his mother, and his brothers are both well-off.
I've never earned anything like he does, though I do okay - but I also knew I wouldn't have anyone else to help, so I don't think I would ever have made the financial decisions he has, because I knew i would have to provide for me. And it is people like him who haven't saved that the government should be pissed off with, because he shouldn't have had earnings like that over his lifetime and have nothing to show for it. I struggle to be sympathetic, because he has never had to decide whether to have beans on toast or the heating on, or to pay the electricity but not the council tax.