The figure below shows the age structures for the world human population in 1950 and 2010 as well as a projection for the year 2100. How did the age structure of the world population change between...

The figure below shows the age structures for the world human population in 1950 and 2010 as well as a projection for the year 2100. How did the age structure of the world population change between 1950 and 2010? How is it expected to change between 2010 and 2100?