Niger is world's youngest country and has highest fertility rate

Niger has been ranked the world’s youngest country with half of its population under the age of 15.3, the 2016 International Data Base of the U.S. Census Bureau says.

The country with a population of a little over 18 million, also has the highest fertility rate with 6.6 children per woman.

The update published on Wednesday revised the data of 14 countries and areas including Cuba, Egypt, Eritrea, Gaza Strip, Haiti, Namibia, South Korea and the United States.

The revision incorporates new data from censuses, surveys, and administrative records and new analyses.

Monaco is the oldest country with half of its population over the age of 52.4. Singapore has the lowest total fertility rate of only 0.82 children per woman.

The International Data Base is a series of estimates and projections that provide a consistent set of demographic indicators, including population size and growth for more than 200 countries and areas.