Young America is making all the right noises in the corporate world. Google co-founder and CEO Larry Page is a legend the world over and Facebook's Mark Zuckerberg, the world's youngest billionaire, follows close behind. Among those on the list is Yahoo! CEO Marissa Mayer, who has recently led the embattled internet giant's makeover. Here's a look at the most powerful US CEOs on the right side of 40, according to Forbes (Click on graphics)

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