After Andrea Rodriguez lost her job last fall, she put away her suits. Not because she didn’t plan to keep working—she just had to seem younger. She’d been a successful sales trainer at SugarCRM, a Cupertino, Calif., company that pitches marketing and customer service software to businesses. Suddenly she was looking for a job in Silicon Valley, and she was over 50. Early in her search, she recalls, one hiring manager told her, “We have a very diverse age group—some people are right out of college, and one older group is as old as 48.” Gulp.