Young girls

Barbie is one of the most popular toys for American girls ages 3-10. 90% of girls in this age group own a Barbie. Every 3 seconds, a Barbie is sold somewhere around the world. Barbie is now sold in 150 countries.

http://collectdolls.about.com/library/blbarbiefacts.htm
http://forthoseabouttoshop.ca/2010/12/15/barbie-love-her-or-loathe-her/