Nooyi, who will remain chairman of PepsiCo until 2019, says she's leaving her position at a time where she still feels young enough to pursue other opportunities, a source familiar with her departure told The Wall Street Journal. In a series of tweets about her exit, the 62-year-old thanked her staff and said she'd never anticipated becoming CEO of such a large company. "Growing up in India, I never imagined I'd have the opportunity to lead an extraordinary company like PepsiCo," she said. "Leading this company has been the honor of my lifetime.