Answer
The shape of the population pyramids for India and China in 1970 is almost identical. Both look a lot like a true pyramid, with about 29% of the population under age 10 and a steady drop-off from age 25 or older. However, India in 2015 is quite different from China in 2015. The top of the graph is a sharply pointed pyramid, with a modest cylinder shape only at the bottom. And the age-group under 10 still makes up 19% of the population, showing considerable potential for rapid growth in the coming decades.
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