"How old are you, children?"
Translation:ben 'ar Suboghpu', puqpu'?
Heh! Now the contributors try to justify why Okrand used boghpu' when their own rules would have him say bogh, which he didn't do.
Okrand used boghpu' in canon because the act of being born is completed in talking about it in this sentence. This is actually the criterion for using perfective in any sentence, but the Duolingo contributors always ignore this rule. They'll parrot Okrand when they copy his canon, but they usually don't allow it in their sentences.
If you said ben 'ar Subogh, you'd asking how many years ago you are in the moment of being born. What the correct sentence (with -pu') actually means is to ask how many years ago you completed the act of being born. You're in the present, looking back at a completed event, not in the past, reporting the event as it happens.