It’s common for people to begin collecting their Social Security benefits soon after they turn 62, ignoring the financial planners and retirement experts urging them to postpone and increase the size of their monthly checks. A new study has uncovered four powerful psychological traits that influence this decision: the individual’s expected longevity, his fear of loss, whether he perceives the Social Security system as fair, and patience. The study surveyed some 3,000 people, primarily in their 40s and 50s. This is a good age to ask about Social Security, because claiming the benefit is a few years away, “but they’re thinking more about it,” researcher Suzanne Shu said when presenting the findings at an August meeting of the Retirement Researc…