At that age he's 18 or less
Tienes = You (informal) have Digo = I say/tell
¿Qué es tu edad? More commonly, ¿Cuantos años tienes?
¿Cuantos años tienes? ¿Cuantos años tienes tu?, which literally translates to "How many years do you have?" (How many years do you have) ¿Cuantos años tiene? ¿Cuantos años tienes?
It means "Do you have a cellphone?"
Tomas, When you have
"You have my body."
I have is (yo) tengo You have is (tu) tienes
You have a stapalor?
Usually this would be "¿Cuántos años tienes?" or "How many years have you?", You could say "¿De qué edad eres?", but this would be less common.
The term "años tienes" as a stand alone phrase does not really mean anything in Spanish. On the other hand, "Cuantos años tienes" means 'How old are you?"
You would say "Are you afraid, little girl?"
Literally, it means "You have luck," but it is use to say "You are lucky."