You could say "quince años de edad". But...if you want to say something like "I am 15 years old", you would normally say "tengo quince años".
Tienes quince años.
You would say "Teresa tiene quince años."
In what language?
Yo tengo quince anos. Literally translated, "I have 15 years". Usually "How old are you?" is asked as follows: "Quantos anos tienes?" (How many years have you?)
15 or 16 years old i would say
To say "he is fifteen" in Spanish, you would say "él tiene quince años." Literally, this means "he has fifteen years." That may seem a little odd to English speakers, but that is how a person's age is described in Spanish.
You could say it just as you have written it here.
Fernando Verdasco is 34 years old (birthdate November 15, 1983).
Some say she"s 15
I would say about 15 to 16 years old.
I'm sorry to say that you cannot get married at 15 even if your boyfriend is 16. Your mother has to say that it is ok and his parents need to say that also.
They live until 15 years