If there are large numbers of people under 15 and over 65, what is the main challenge it creates for a country?
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During the Paleolithic Era, humans grouped together in small societies and subsisted by gathering plants, and fishing, hunting or scavenging wild animals.
The Neolithic Revolution references a change from a largely nomadic hunter-gatherer way of life to a more settled, agrarian-based one, with the inception of the domestication of various plant and animal species—depending on species locally available and likely also influenced by local culture.
There are several competing (but not mutually exclusive) theories as to the factors that drove populations to take up agriculture, including the Hilly Flanks hypothesis, the Feasting model, the Demographic theories, the evolutionary/intentionality theory, and the largely discredited Oasis Theory.
The shift to agricultural food production supported a denser population, which in turn supported larger sedentary communities, the accumulation of goods and tools, and specialization in diverse forms of new labor.
The nutritional standards of Neolithic populations were generally inferior to that of hunter-gatherers, and they worked longer hours and had shorter life expectancies.
Life today, including our governments, specialized labor, and trade, is directly related to the advances made in the Neolithic Revolution.