Indeed... Bella does. Bella could easily be another college girl (well... she has the same skin as Quinn; if Quinn can, so does she). Nora, on the other hand, looks like she's in her 50s, 45 in the best scenario. Of course, everything is possible, but, when it comes to stories, the best thing to do is to make things look natural and not ask for your audience to make excuses for you, so, if she's indeed younger than Bella, I consider it a serious case of bad "casting" (that is, election of which model to use) from Mr. DPC, aka, "Il Perfetto." Let's hope she lied about her age, so we'll still be able to believe Mr. DPC never errs.