Both of these are correct, just different tenses:
How old were you (when you did something)?
How old are you (now)?
"there" seems superfluous here. In this case, it would designate a location, which doesn't make sense.
28 januari 2015
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Heb je je antwoorden nog steeds niet gevonden?
Schrijf je vragen op en laat de moedertaalsprekers je helpen!