Gender and age neutral word for partner (not married) in Mandarin? I'm looking for a gender neutral word for a person that you are in a romantic relationship with, but not married to. Similar to "partner" in English.

I also want it to be fairly neutral regarding age and to work in formal settings.

Which word can I use?
恋人 perfectly fits your need, its gender and age neutral, and can be used in formal settings.

情人 somehow fits your need, but is not as good, because it could also mean an extramarital lover, which may cause misunderstanding.

爱人 is also gender neutral, but usually refers to partner in marriage.