The population of Africa has grown rapidly over the past century and consequently shows a large youth bulge, further reinforced by a low life expectancy of below 50 years in some African countries. Total population as of 2017 is estimated at more than 1. 25 billion, with a growth rate of more than 2. 5% p. a. The most populous African country is Nigeria with 191 million inhabitants as of 2017 and a growth rate of 2. 6% p. a.