Niger (pronounced: NIH-jer) is an arid, landlocked country of the Sahel with a population of 16 million. It is bordered by Algeria, Mali, Burkina Faso, Benin, Nigeria, Chad and Libya. Niger is a former French colony which was granted independence in 1960. The land is mostly desert plains and dunes, with rolling savanna in the southeast.
Generally the worlds youngest country is determined by calculating the portion of the population that is younger than 15. Presently it is Niger that holds this distinction with roughly half of its population having barely reached puberty (49%).
Source: http://wikitravel.org/en/Niger, https://travelforfreebook.wordpress.com/2012/05/29/25-amazing-facts-about-countries-around-the-world/