Sounds like a Bowie song!
Hva betyr det? Fem år together?
i think it's our second bowie lyric among all these song lyrics in the course. https://www.youtube.com/watch?v=4bcnO3VQ_fc
... det er alt vi har.
Why it is år and not årer?
It seems to me that what's written is "we have 5 year"
Monosyllabic neuter nouns don't get any added ending in the indefinite plural.