If you went into retirement unwillingly, you can come out now.The jobless rate for workers 55 and older is just 3.1 percent, according to AARP’s calculation of government jobs data last month. That’s even lower than the 3.9 percent for workers of all ages.In a recent client survey by outplacement firm Challenger, Gray and Christmas, nearly 65 percent of companies said they were in a hiring mode, 25 percent were in “retention” mode and just about 7 percent were downsizing.“It’s a great job-search climate for anyone, but it’s particularly good for older workers,” said Andrew Challenger, the firm’s vice president.Experienced workers with industry-specific skills are in the highest demand, but the market is good across the spectrum, he said.