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"once a women turns 19, she may as well be postmenopausal"
(sh.itjust.works)
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It's quite a bit older than that. 1800s, I believe? A "spinster" was a women who got a job spinning/weaving fabric, which was one of the few jobs women were allowed at the time, and they were paid for it! Very well, iirc.
So a woman earning her own income and able to support herself, not being required to marry in order to live comfortably.