The sliding scale of introduction for state pension meant I didn't get my pension till the July when I was 63 (born Nov 52) so I missed out on payments for 3 years 9 months, I received about £150 a week pension, initially, so actually I lost nearer to £25,000, now I've worked it out. Obviously, women born after me will have lost a lot more. I still continue to work p/t as I cannot live on the state pension alone.
As far as I'm concerned, my 'contact ' with the government was to work from 18-60, pay national insurance and then get OAP. If men felt hard done by ( and I agree pension age should always have been equal from the start) they should have campaigned to change it. If there weren't so many people in the country receiving benefits of some kind the pension age would never have had to be revised.
There is only a finite pot of money but I don't see why women born in the 50s and pensioners to be, in general, should have to work longer to bear the brunt of it when others expect to receive state help just because relationships have broken down or they didn't have a reliable partner in the first place or they can't be bothered to hold down a job or only chose to work p/t. Why other taxpayers should be expected to fund that, I have no idea!