I think the reason a lot (not all) of older single women end up bitter and angry is because they are now experiencing what it’s like to be a man in dating.
A lot of women imagine they’d prefer to be invisible like 98% of men are their entire lives. However, when they actually have the experience of being disappeared they do not like it so well at all. Ask Norah Vincent — well, you could if she were still alive. Her project of dressing and acting as a man for 18 months contributed greatly to her suicide. She also mostly recanted her incorrect beliefs about men’s lives and experiences (which most feminists still hold).
Glad I’m not in that market now. Most women are utterly, hilariously undateable. Their over-inflated self-regard is only exceeded by their girth and unappealing personalities.