Well, nothing is theoretically stopping men from saving all the extra money they make and retiring sooner, right?
I don't think it really matters to most whether they are retired or working during those extra 5 years which men do not get to enjoy.
Thankfully, we're not in a society where an individual can readily be sacrificed for the good of the community (unless they choose to, and if they do, we call them heroes and hold them in admiration...)
I don't think society. I think much bigger. Species. And from that perspective it is perfectly fine to sacrifice an individual (as long as it is not me, of course). Nature sacrifices millions of individuals on an ongoing evolutionary basis. But even within communities, we do sacrifice individuals for various purposes such as school taxes paid by those who have no kids, or road tax by those who do not own cars. That is not the ultimate sacrifice but those occur too. How many US soldiers are have been sacrificed in the US history so far? And why?
Not knowing the details, I can't comment why there aren't many women at your place but, at the very least, if a woman does apply, I would expect she would be allowed to do so, her candidacy would be evaluated using the same criteria, she would be paid the same as her male counterparts (unless she underperforms), and she would have the same chances for promotion (again, unless she underperforms).
There is absolutely no discrimination of any kind where I work. Just remembered, they do hire Summer students for outside grounds maintenance. There was indeed one girl here once. Same jobs, same pay. She was quite physically fir and I'd say physically stronger than many male Summer fellas.
The reason there aren't any (or so few) women filling the aforementioned positions is because the work is ******. They get to work 16 hour shifts in Winters, including Christmas Day. Regular shifts during warmer months are almost perfection with all the flowers blooming and birdies yapping, except that when you have to fix a municipal drain filled with floating **** the charm is kinda gone. Digging a grave on cemetery, even with a backhoe, isn't that charming either. If you see those guys' hands, they look like 60 grit sandpaper. The work is tough and physically demanding. Few women would like to do that as the job is not very compatible with any known brand of nail polish and the scent of perfumes is soon covered by the smell of diesel (fuel, not the cologne).