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Questions & Answers about ¿Cuántos años cumples?
Wait, I learned that "How old are you?" is ¿Cuántos años tienes?. Why is this sentence different?
How do I answer this question?
You can answer using the same verb. For example, you can say Cumplo treinta años (I am turning thirty) or simply Cumplo treinta. You could also just answer with the number itself.
Is the verb cumplir only used for birthdays?
Why does Cuántos end in -os here?
The question word cuánto (how much or how many) changes its ending to match the noun it describes. Because años (years) is a masculine and plural word, cuánto becomes the masculine plural cuántos.