How old are you? = Quel âge avez-vous?
"How old are your twin daughters?" would be translated in French "quel âge ont tes jumelles ?"
Quel-age tu?
take a french class or write it down in french or kiss her or he
Well I have one at this age and all you do is ask a friend to ask him if he like likes you then I new what to do!!
Quel age as tu?
a riba derchi lol
quel âge avez-vous?
Demandez à votre ami(e)
qu'est ce que tu fais
Well depending on how old you are if your around that age you can just have a friend/ friends ask him
No, "friend" is not a plural in French. The word for "friend" in French is "ami" for a male friend and "amie" for a female friend.
A "model letter to a French friend exam" does not mean anything, you'd better ask again and rephrase in full details.