How old are you?Tengo ___ años.I'd just like some extra props for the fact that I remember that from High School spanish class (which was about 30 years ago)
1. How old are you? (this is the "familiar" form of "you"; In a formal sentence it would be: ¿cuantos años tiene Usted?2. The answer in both cases is : Tengo doce (twelve) años (or whatever the age is...).