Translation:The quiet old man and the quiet woman are sleeping.
FYI: the original sentence had a mistake (as noted by some users already). We've updated it and it's reflected in this sentence discussion, but sometimes it takes a few days before it's reflected on the user side in the lessons. Apologies for any frustration until the update goes through the system.
There is a 4th declension noun ănus (genitive case ănūs). Lewis and Short give the definition "an old woman (married or unmarried), a matron, old wife, old maid (sometimes in an honorable sense, but com. as a term of contempt)."
Not to be confused of course with the 2nd declension word ānus (genitive case ānī) meaning "a ring; hence, the fundament."