Scandinavia and the World

Comments #9422600:

How old? 12 11, 6:16pm

This is simply incorrect. The Kalmar Uniuon wasn't denmark, it was the kalmar union, a union of crowns (kind of like the united kingdoms). So either Denmark and Sweden came into being at the same time as the Kalmar union ceased to exist, or both kingdoms existed as part of the union.