The pie charts compare the percentage breakdown of populations based on their ages in two countries, Nigeria and Greece, in 2012, along with the forecast for 2055.
Overall, the 15-59 age group represents the largest share of the population in all charts except Nigeria in 2012, when 0-14 is largest. By 2055, Nigeria is projected to have the smallest 60+ share (5%), while in Greece the smallest group is expected to still be 0-14 (15%).
A more detailed examination reveals that in 2012, residents between 0 and 14 years old made up roughly half the population of Nigeria, becoming the largest proportion, whereas only 16% of the Greek people were in this age group. Both Nigeria and Greece’s populations at the age of 15 to 59 also made up significant proportions, the former showing 47% and the latter showing 62%. Only a tiny fraction of Nigerian people comprised the older generation in 2012; by contrast, around one in five Greek people were aged 60 or over.
In the future, shares of population older than 60 are expected to marginally rise by one percentage point in Nigeria, from 4% to 5%. The share of people below 14 is projected to drop by exactly 10 percentage points in the African country, eventually constituting 39%; this figure is also predicted to fall in Greece, albeit slightly, from 16% to 15%. In both nations, the population between 15 and 59 years is predicted to remain the largest group in Nigeria (56%), but in Greece it falls to 47%.