Mike Trafton bought a house in a suburb of Boise, Idaho, where he plans to retire. He made the deal without signing a stack of mortgage papers. Trafton, 55, and his wife Cindy, 54, paid $400,000 in cash for the 3,200-square-foot house in Eagle after selling their 4,400-square-foot home in a Portland, Oregon, suburb for $680,000. Like a growing number of baby boomers, born between 1946 and 1964, the Traftons had no desire to get a mortgage.