If a woman is currently a single, childless 30+ year-old and she's still dating is that the female equivalent of an incel.
After all, both fail in their main function from a biological point of view. Meanwhile the man for whatever reason can't attract a woman and remained an involuntarily virgin, the woman had a couple relationships (live-in bfs that leads to a break-up; she just can't get a man to marry her) but has been unable to get a man to commit and give her kids within her best years.