Why they call Europe the Old World

When I watching Europe traveling TV shows, I can't help but notice that there are many old people live there. According to a joint report by the European Commission and AARP (a U.S. lobby for the elderly), 24 of the world's 25 oldest countries are in Europe. (Japan is another one).
Using Italy' as an example - Italian life expectancy is 78.3 years for men and 84 for women. 26% of its population are older than 60 in 2005, One out of every five elderly Italians is over 80.
No wonder they call Europe the Old World.

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