I know it's a bit late, and you probably have figured that one out. But in case you haven't, that distance, in a better terminology, is called nasal bridge. The thickness of our nasal bridge is actually determined by the thickness of our nasal bones and a muscle called Procerus. Men usually have thicker of both, while women's are more shallow and smooth. Ethnicity also plays a huge part in this particular facial feature. Caucasian tends to be on the thicker side, while other ethnicity, like African and Asian, tend to be on the shallower side.

It varies wildly between individuals, so it is hard to say anything about it...