"She is barely seventeen years hot." ... Would you please take a seat over there, Duo.
In case you haven't figured this out yet, you don't need to write "Years old". Just so you don't waste too much extra time typing! ;)
dwarven_hydra - I am afraid you are not right, DUO wants the little word "old" at the end, even though nobody uses it and nobody needs it there.
I thought 'appena' also meant 'just' which would imply the meaning 'he just turned seventeen' (rejected).
Appena means both scarcely and barely - they are interchangeable in English expressions. I am sure others will agree. I can scarcely wait for their comments.
Not always interchangeable. 'Barely' can also mean 'openly', as in "they told him the news barely". 'Scarcely' can also mean 'probably not', e.g. "you could scarcely have chosen better". You could get away with using 'barely' there, but 'hardly' would be a more common use.
Why does duoliingo sometimes give me a correct answer when i spell a word incorrectly and other times mark it wrong?
Because sometimes the spelling mistake is just that but other times it makes the word mean something different but relevant in the context of the question. For example (although duo might still Mark this one as wrong): If you had to give the Italian for 'he', which should be 'lui', but you typed 'lyi', you've clearly mis-typed as that word means nothing (to my knowledge). Whereas, if you'd typed 'lei', that means 'she' which is relevant in the context of the question. From what I've seen, proximity on the keyboard to the correct letters also seems to make a difference as well as things like leaving out one letter when you should have 2 in a row (typing 't' instead of 'tt')
I thought "he is just [as in 'only'] seventeen years old" would've been OK ... but not according to the owl.