¿Cuántos años tienes?

In class we have been learning Spanish. Mr V. lived in Spain for a year so he is teaching us.
So far we can greet and farewell each other, Count to 20 and have learned how to count to 100.
Our biggest challenge so far is to ask each other how old we are! This is an example of a conversation we have performing in class:

Hola Amigo (Hi Friend)

Hola (Hello)

¿Cuántos años tienes? (How many years do you have?)

Tengo _____ años. (I have ____ years.)

¿Y tú? (And you?)

Tengo _____ años. (I have ____ years.)

Adiós (Goodbye)

Hasta Luego (See you later)