woman approaching middle age
A somewhat dated term for a woman in her late 30s to 40s, often with a nuance of being past her prime. Modern usage may be considered impolite or old-fashioned.
She said that because she's already a middle-aged woman, she can't wear the same clothes as young girls.
Formed from 中 and 年増, an older term for a mature woman. 中年増 denoted an age category within the traditional gradation of women expressed by compounds of 年増.