It is useful to look at the comparison between countries: - just static graphics: http://static.gapminder.org/files/vector-graphics/gapminder-world-2013.pdf ht

It is useful to look at the comparison between countries: - just static graphics: http://static.gapminder.org/files/vector-graphics/gapminder-world-2013.pdf http://static.gapminder.org/files/vector-graphics/gapminder-... - interactive, new data: http://www.gapminder.org/tools/bubbles#_state_marker_size%2F_label_extent@:0&:1;;&axis%2F_y_zoomedMin:45.8;&axis%2F_x_zoomedMin:543.53&zoomedMax:140375.09 http://www.gapminder.org/tools/bubbles#_state_marker_size%2F... - text: http://www.gapminder.org/posters/gapminder-world-2013/ http://www.gapminder.org/posters/gapminder-world-2013/ To be honest, since there is variation between countries (for Russia vs Japan it is ~20 years!) it would be really surprising if there were no variation within countries (especially as uneven economically as US).