According to the 2010 revison of the World Population Prospects the total population was 23 391 000 in 2010, compared to only 6 442 000 in 1950. The proportion of children below the age of 15 in 2010 was 44.1%, 52.6% was between 15 and 65 years of age, while 3.3% was 65 years or older .
What are the poorest countries in the world? The rankings below were published in Wikipedia from International Monetary Fund’s 2011 gross domestic product per capita (GDP per capita) report and reflecting the countries with the lowest purchasing power parity (PPP). Since 1970, there has been encouraging news emerging from developing countries. According to the UN’s 2010 Human Development Report, life expectancy in developing countries has increased from 59 years in 1970 to 70 years in 2010. School enrolment climbed from 55% to 70% of all primary and secondary school-age children. Also, in the last forty years, per capita GDP doubled to more than ten thousand U.S. dollars. Poor countries are catching up with the wealthier countries, but not all countries are making fast progress. For example, some countries in Sub-Sahara Africa have little or no progress, largely due to the HIV epidemic and civil wars.