on the test, the "correct" result was "tengo cincuentos años". Do numbers change according to the noun they are adjectives of?
I think you misread the sentence. It is saying:
¿Cuántos años tiene usted? - ___ cincuenta años. (How old are you? - I am fifty years old.)
You don't add -s at the end of the numbers to make it match with the plural noun (in this case "años"). It is already a plural adjective.
This lesson is dealing with this. Have a look here.
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