[
](http://www.npr.org/blogs/money/2013/12/09/247385046/the-global-population-boom-and-bust-in-4-gifs)
…and the US is getting older fast.
[
](http://www.npr.org/blogs/money/2013/12/09/247385046/the-global-population-boom-and-bust-in-4-gifs)
via NPR’s Plannet Money