Professionals in their mid-20s have been responsible for some of the most remarkable innovations of the past decade, and the reason could be that young people are more open-minded and have a greater capacity for risk. "People under 35 are the people who make change happen," venture capitalist Vinod Khosla said recently. "People over 45 basically die in terms of new ideas." The rise of social networks and other technologies has made it easier for young people to overcome the constraints of traditional hierarchies, Andrew Ross Sorkin writes.

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