What is an old bachelor called?

In the United States, spinster is the legal term used to refer to a woman who has never married, just as the male counterpart of bachelor refers to a man who has never married. Once men and women are married, they can never revert to the state of never married.

What do you call a man that is unmarried?

Single men are often simply referred to as bachelors. The English language has more terms for single, unwed women. Single women are sometimes called bachelorettes, especially in festive contexts in American English.

At what age does one become a spinster?

According to several sources, you become a Spinster at the age of 23. Traditionally, women were married off young, to increase their chances of providing a Son for their Husband. Some sources say you were only a spinster from age 23 to 26 though.