Retirement parties are usually cake, a slideshow and a handshake. But for many baby boomers, leaving work is also the first time they look back at how they treated people. In a recent Traliant survey of more than 2,000 U.S. employees, about one in five said they had been mistreated at work in the past 5 years, and fear of retaliation was the top reason people stayed quiet. Sometimes wisdom comes with aging, and sometimes it takes a grandchild and a little empathy to arrive.Theresa K., 49, a claims adjuster from Milwaukee, Wisconsin, learned that an apology can come 17 years late with an act of kindness and still matter.