middle-aged woman
Neutral term for a woman in her middle years; can be used in everyday conversation without strong positive or negative connotations.
あの中年女の人は、近所のパン屋さんです。
That middle-aged woman is the owner of the neighborhood bakery.
Refers to a middle-aged man, while 中年女 specifically refers to a middle-aged woman.
More casual and can be used for any middle-aged woman, but may carry a slightly familiar or sometimes dismissive tone depending on context; 中年女 is more neutral and descriptive.
Compound of 中年 (middle age) and 女 (woman).