¿Qué edad/cuantos anos tiene su / tu / vuestramamá? (tilde on 'n' in 'anos')
*Su --- de usted / de ustedes (your) (formal, both singular and plural; only formal and familiar in Spanish America)
* tu --- de ti (your, familiar singular)
*vuestra --- de vosotros, as (your, familiar plural for both genders.)
Cuantos anos tienes?
When you are talking about yourself, you say "Tengo (your age) años."
Leave it where it is because it is natural! If there is no mother ask someone if you can look after it for a while until it is old enough to fly and fend for it's self!
¿Cúantos años tienes?
Very carefully! Of course it is bad form to ask how old a mature woman is in Spanish cultures. (How many years does your grandmother have?) ¿Cuántos años tiene su (formal)/tu (informal) abuela? Rembember, the ñ and n are not interchangeable. anos is NOT the same as años.
Cuantos anos tiene ella?
cuantos anos tienes
ask one of her/his friend or ask one of your friend to ask her/him.
If you want to ask someone how old they are just ask them.
"How old are you?" in Norwegian is "Hvor gammel er du?"
There are many questions that you can ask someone such as....What's your name?What grade are you in?How old are you?
If you want to know how old someone is just ask them.