Brisk sales of Linda Novak’s crocheted scarves and baby blankets have subsidized the 62-year-old’s Manhattan rent since her 2012 layoff. Boston resident Marcus Queen, 58, receives food stamps while trying to reignite his beloved career: helping city kids get a leg up. Joseph Imperiale, 66, wants to get back into the business world, so he doesn’t have to tap his retirement savings yet. Nearly three years after the Great Recession officially ended, more than 900,000 baby boomers laid off several months or years ago are still pounding the pavement, unable to find employment in an economy that produced only 88,000 jobs in March. They simply are not ready to retire – financially or emotionally – but they often feel that…