Asks the age of the interlocutor.
Literally: What is your age in years?
(impolite) Used to question the mental age (maturity) of the interlocutor.
Jack: (laughing at infantile humor)
Jill: How old are you?
How old are you?
(China, humorous) Why is it always you? You again?
How old are you Hogo.” "Thirty-five Jane. A not unpleasant age to be.” "You don't mind then. That you are not young.” "It has its buggy aspects as what does not?” "You don't mind then that you are sagging in the direction of death.” "No, Jane. Donald Barthelme
How old are you Johnny" she asked. Sixteen." And what's that-a boy or a man?" He laughed. "A boy in time of peace and a man in time of war. Esther Forbes