Is the word "noble birth" used to ask elders or young people?

[gu gung]

A compliment of asking people's age. Geng, refers to age.

How old is the other party this year? It is often used to ask about the age and written language of elders. In ancient China, some literati often used each other, one to show their knowledge and the other to show their respect for each other. For example, "May I ask your age"?