Fortune Magazine has selected the 50 most powerful women in America for 2007. Most of these women are in their 40's and 50's. It's interesting to look at the hairstyles these powerful women have chosen. See all the photos here.

Shown here are Susan Arnold, age 53, President, Global Business Units, Procter & Gamble; Dawn Hudson, age 49, President and CEO, Pepsi-Cola North America and Indra Nooyi, age 51, Chairman and CEO PepsiCo.

Also check out this before and after video of Katie, who changed her hairstyle when she turned 40 years old;