The collection I cited is all the countries in the world today. I don’t think you can get a bigger sample.
What about historically? The set of nations that exists now is a subset of all the nations and empires that ever existed. What was the median age in France in 1700?
What about historically? The set of nations that exists now is a subset of all the nations and empires that ever existed. What was the median age in France in 1700?