Men have always had far higher pensions than women - Arriva currently estimates the difference to be 40.3%! That’s not ‘losing out’ in my book.
They may have had to work longer in the past, but that does not make the decision to raise the retirement age for women fair. The differential meant that more couples had a retirement together, as men tend to be older than their wives, and went some way to compensate women for the huge financial disadvantage they had suffered throughout their working lives. I suspect the thinking was that women would be able to look after their husbands too - who would make their meals and stir their tea if the women were at work?