Question

What is supposed to be in the fill in blank?

Answer 1

If you need to use another word for tener it’s tengo which means I’m and años is years so whatever number you put for example like tengo cinco años if you translate it says in English I’m five years old

Answer 2

Tener means 'to have' and anos means 'years' and i'm guessing you could write any number in the blank so i think it'd be "Tener (any number, like tres) anos"