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Since 1950, the median age in the developed world—North America, Japan, Europe and Australia/New Zealand—has increased from 29 to 37 years. In contrast, the median age in the developing world—Africa, Asia (excluding Japan and Australia/New Zealand) and Latin America—stands at only 24 years. However, this incredibily short life of say 48 years—double the median—is due to African AIDS.

Today’s workers have to save more, work longer, retire later, receive less generous benefits and pay more taxes. A reduction in pension benefits is also threatened. Should fertility, migration rate, the employment ratio and the average age at retirement be increased ?