Quel age avez- vous when translated to English becomes 'How old are you'.
"How old are you?"
quel âge as-tu / avez-vous ? quel est ton âge ?
quel âge avez-vous?
quel âge avez-vous
Quel âge as-tu? = informal Quel âge avez-vous? = formal
(formal) 'Vous avez quel âge' (informal) Tu as quel âge
How old are you? = Quel âge avez-vous?
How old are you ?(for example) is translated in french in "Quel âge avez-vous ?" (polite form) or "quel âge as-tu ?" (to someone you know) literaly (what is your age ?) Christophe
If you're speaking to someone you know (aka a friend) it's "Quel âge as-tu ?" (literally translates to "What age do you have") If you are speaking to a person of authority (aka a boss a teacher) OR to two or more people then its "Quel âge avez-vous ?"
Quel age a ton amie means how old is your friend?
''Simon a quel âge?'' would mean ''How old is Simon?''