Joe Grier, a 98-year-old man who lives in Chicago and is believed to be the oldest full-time employee in the U.S. is sharing some wisdom after he just celebrated his birthday . Grier, who still works every day, said his longtime job as a craftsman at one of The Planter Companies is part of what keeps him happy. “It makes me feel good,” he said in an interview with Fox 32. “I’m able to associate myself with things that I’ve associated myself with for so long. It’s a habit.”