No-one I know quarrels with the idea of equalising pension ages for men and women. But that process was begun with a gradual postponement of womens' pensions until the Cameron government decided to speed it up hugely. The result of this is that women born a month later than others had to wait more than a year - sometimes 2 or 3 - compared to women born a bit earlier for their state pension. There's nothing fair about that, and the "cost" is only relevant if you calculate it from the loss of savings from that unfair rapid process. Even then, the "thousands of billions" mentioned is utterly laughable.
I agree that Corbyn was a major factor. However, if you look at where Labour lost seats (mostly the North & Midlands) they were nearly all Leave seats. So to that extent, i.e. statistically, it WAS a Brexit election.