But important as that group is, it makes up a relatively small part of the youth population as a whole.

但尽管这个集体很重要，却只代表了整个青年人口中相对较小的一部分。

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A Norwegian demographer, Henrik Urdal, reckons a country's risk of conflict rises four percentage points for every one-point increase in the youth population.

挪威人口统计学家亨利克•厄达尔认为，一个国家的年轻人口每增长一个百分点，其发生冲突风险的几率就会提高4个百分点。

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In urban areas, the youth population is larger than it has ever been and growing.

UNESCO: Almost four million young people in Central Asia and Central and Eastern Europe fail to complete primary | United Nations Educational, Scientific and Cultural Organization

Women and girls make up nearly two thirds of the illiterate adult and youth population.

UNESCO: Message from the Director-General on the occasion of the International Literacy Day | United Nations Educational, Scientific and Cultural Organization

The youth population expanded in 31 of the 51 metro areas from 2000 to 2010.

FORBES: America's Baby Boom And Baby Bust Cities