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QUICK ANSWER
"Cuántos años tienes" is a form of "cuántos años tienes", a phrase which is often translated as "how old you are". "Cuándo es tu cumpleaños" is a form of "cuándo es tu cumpleaños", a phrase which is often translated as "when your birthday is". Learn more about the difference between "cuántos años tienes" and "cuándo es tu cumpleaños" below.
cuántos años tienes(
kwahn
-
tohs
ah
-
nyohs
tyeh
-
nehs
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (general)
a. how old you are
Dime tu nombre y cuántos años tienes.Tell me what's your name and how old you are.
cuándo es tu cumpleaños(
kwahn
-
doh
ehs
too
koom
-
pleh
-
ah
-
nyohs
)A phrase is a group of words commonly used together (e.g., once upon a time).
1. (informal) (second person singular)
A word or phrase used to refer to the second person informal “tú” by their conjugation or implied context (e.g., How are you?).
a. when your birthday is
Tienes que decirme cuándo es tu cumpleaños porque quiero hacerte un regalo.You must tell me when your birthday is because I want to give you a present.
