Cuantos anos tienes translates to "how old are you?" in english
The English translation for cuántos is "how many" or "how much".
cuantos dias hay en una semana
Definition of Cuantos: How many
It means "How old are you?"
Cuantos = "How many" or "How much" Cuantos(pl, cuanto, sing) means how many. I think you'd mistaken cuantos for cantos. Cantos(pl, canto, sing) means sides.
it means: how many are we today?
"How old is your grandmother?"
¿Cuántos años tienes?Cuantos años tienes?
The phrase "entonces tu cuántos años tienes tú" translates to "so, how old are you?" in English.
"How many days are there in a year?"
it means 'How many seconds are (there) in a minute?'