In 1939, David Packard and William Hewlett launched Hewlett-Packard out of a 12-by-18-foot garage on a leafy street in Palo Alto, California.  Photograph: Kim Kulish/Corbis via Getty Images

The “young guys founding a company” trope (extra points if in a garage) is one of the most cherished clichés in Silicon Valley. And that’s a problem.&(...)