While we are hardy—Icelanders live to an average age of 82, more than 10 years longer than the global average—there are more factors to consider than Viking DNA, like the fact that we’re trained to find the cold rejuvenating: as infants, Icelanders nap outdoors in all weather.

Sure they live 10 years longer but most people would give up the last ten years to live somewhere warm.

Plus, cold is not good for fresh produce:

http://pandawhale.com/post/59290/elegant-design-solutions-to-save-your-food-from-languishing-in-the-fridge