How do you ask someones age in spanish?

"How old are you?" in Spanish is, "¿Cuántos años tiene? It is pronounced, "KWAHN-tose AHN-yose tee-EHN-ay?" Sites such as learn-spanish.co.il provide audio pronunciations of many common Spanish Words.

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^^ ¿Cuántos años tienes? When it's informal.... ^^