Country age demographics are determined by two key factors: fertility and mortality.
Throughout history, it was typical to see both birth and death rates at higher levels. But today, in most parts of the world, women are having fewer children, and innovations in healthcare and technology mean we are all living longer. The average person today lives to 72.6 years old, while the rate of births per woman has fallen to 2.5.
These trends have drastically altered the demographics of mature economies, resulting in a much older population. In many developing countries, however, births still outweigh deaths, resulting in populations that skew younger.
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