Well here is a map that shows where the majority of people live...
http://www.paulnoll.com/China/Population/population-distribution.html
These sites show the different ratio of female to males in China.
http://www.xist.org/earth/pop_gender.aspx
http://www.msnbc.msn.com/id/5953508
http://www.indexmundi.com/blog/index.php/2008/06/13/population-of-china-by-gender/
Population in China by age groups. This is one of the sites I got when I typed in the population projection in China.
http://www.iiasa.ac.at/Research/LUC/ChinaFood/data/pop/pop_7.htm
http://unpan1.un.org/intradoc/groups/public/documents/APCITY/UNPAN004769.pdf
http://en.wikipedia.org/wiki/Demographics_of_the_People's_Republic_of_China
