You say, "Tienen doce años."
doce
12 in Spanish is "doce" pronounced like "dos-eh"doce (doh-say)
doce y doce de la tarde
You would say son las doce quince
Doce (dough-say).
In Spanish, you would say "doce punto cincuenta" for 12.50. If you're referring to money, you could also say "doce con cincuenta" or "doce euros con cincuenta" for clarity, depending on the currency.
I am 12 years old and my birthday is July 28.
Tengo ocho años.
Tengo doce.
To answer, Cuantos anos tienes?( How old are you?) You say: Tengo __ anos. Filling in the blank with your age.
Tenho 25 anos. or Tenho 25 anos de idade.
Docinho, Meu Doce