Look, I feel the same. My MIL worked for about a year when she was 16, and then got married and that was the last of it. She's 88.
But it was different times.
I don't know what she gets as an income as I would never be rude enough to ask, but she has a lovely home. Council. She does have her home lovely, through a number of ways. Nothing illegal! She's a wee catholic woman.
But sometimes, eg, when she got a new kitchen, new central heating, then new windows, it grates a bit, because I had to pay for all those things with her son and we have both worked since we left school! Plus she got her pension at 60. I won't get it until I'm 67. Plus her council tax is free and I need to pay mine - I could go on...
BUT, I gave my sons house deposits, they are both high earners who were supported by us for degrees, masters etc, they will get an inheritance,though none of them need it and tbh, as much as there were times I hated my work, I mainly loved it and I have a great circle of friends that I met at work and her friends = 0. Plus she has two sons on benefits.
It's swings and roundabouts and there is no point resenting the generation above you, because it gets you nowhere.
They are a product of their times.