Well, I've never lived in any other except for Canada.

But aside from how aging affects manifestations of common illnesses (colds, etc.), I have to say that living in different parts of Canada made me realize that even for a reasonably healthy person like me, there can be differences of how colds, fevers can be.

Because the prairie air is much drier year round (at least in Alberta), sometimes a cold-cough, becomes a dry cough...which is something I didn't experience until I lived in this region. It pisses me off to cough like crazy but I have little phlegm in my nose/lungs. My nose gets all dried up...because of the air. The air is dry enough, that unless people have humidifiers in their homes, some people experience nose bleeds more often.