"How old are you?"
Translation:Quantos anos você tem?
I thought so too... I actually would have got it wrong anyway, because I misspelled the word Quantos, but when the correction appeared, it said "Quantos anos tens?" ... Unless I also misspelled tem and I was the one who wrote tens and thought it was the correction, but that would have been a huge coincidence... anyway... so tens is the conjugation for "tu", although tu is not usually used, as I understand, right?
I put "quantos anos tem," and they counted it wrong, and then they SPECIFICALLY said that "quantos anos tens' was the right answer and that 'tem' was the 'ele/ela' form of the verb and that 'tens' was the 'você' form. But here on this page, it DOES say "quantos anos você tem." Is it because I forgot to explicitly put 'você'? WTF!? lol.
In regions using the (original) second person singular (tens), the pronoun (tu) can be safely dropped as it is the only possible subject for this conjugation. On the other hand the third person singular (tem) is used both impersonally and with several pronouns (você, ele, ela, a gente), so it's always safer to explicitly use a pronoun if there is no context.