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Silicon Valley is the global hub for e-commerce and for much of the world's technological innovation. You might also call it the world's most successful micro-climate of free enterprise: investors in California's Bay Area seem to have a special knack for picking winners - from Microsoft and Apple to Facebook and Google.

Yet rumblings are afoot, as critics point to a growing obsession with youth. To be successful, they say, you need to be fresh out of a college engineering degree, and a total workaholic. Those over 30 need not apply. So is Silicon Valley ageist?

For Assignment, the no longer totally youthful, Ed Butler has been to California to find out.

(Photo: An office building in East Palo Alto, Silicon Valley California. Credit: Shutter Stock)