That might be so for the exact same role, in the circumstances you describe (although not that often, when outside the public sector people negotiate their own salaries when moving jobs! I negotiated a higher salary for my current role than the previous incumbent, because I could, although it’s more often men who do that), but women are still choosing the lower paid professions because they are seen as more family friendly.
Example: teaching assistants are paid a pittance. I am surprised how little they earn. And yet, competition for TA jobs is, I hear, ferocious because well-qualified women want to do them to accommodate children.
So whilst on the face of it the pay gap has closed slightly since the 1980s, younger women aren’t that much better off. To say nothing of student debt: in the 1980s only 10% went to university. Now it’s closer to 50%, and we regularly hear, on this site, about jobs asking for a degree when 30+ years ago a few O levels would have sufficed. Younger women carrying debt for their student living costs - not their tuition fees, their living costs - but now earning below the national average, I.e. no so-called ‘graduate premium’, might argue that if they had been born in the 1950s, they would have been better off.
What I’m saying is, every generation has its challenges so it’s hard to argue for the 1950s born women, exceptionally, being allowed to claim state pension much earlier on the grounds of unique disadvantages (sexism, lack of opportunity, not approving of the eleven plus, [still haven’t worked out why that is relevant], lack of childcare, shorter maternity leave).