Rank Name Age Country Category 1 Angela Merkel - Chancellor 57 Germany Politics 2 Hillary Clinton - Secretary of State 64 United States Politics 3 Dilma Rousseff - President 64 Brazil Politics 4 Indra Nooyi - Chief Executive, PepsiCo 56 United States Business 5 Sheryl Sandberg - COO, Facebook 42 United States Business 6 Melinda Gates - Cofounder, Gates … [Read more...] about 25 Most Successful Women (Forbes 2011)