老姑娘 lăo gū niáng

老姑娘 lăo gū niáng

解释：大龄还未出嫁的女性。

Explanation:
Spinster.

Dialogue:
A：línlín jĭ suì le？zĕnme hái méi jiēhūn？
A：琳琳 几 岁了？怎么 还 没 结婚？How old is Linlin? Why doesn’t she get married yet?
B：tā yĭjīng 35 le，lăo gūniáng le。
B：她 已经 35了，老 姑娘 了。She is 35-year-old, a real spinster.