With a median age of 19.5, Africa has the youngest population in the world. Niger is Africa’s youngest country with a median age of just 15.3 years. Africa is also home to the oldest head of state in the world, 93 year old Zimbabwean President Robert Mugabe.
The median age is the age that divides a population into two numerically equal groups; that is, half the people are younger than this age and half are older. It is a single index that summarizes the age distribution of a population.