In 2000, Social Security launched a website allowing retirees to sign up for their benefits online without having to call or visit the agency. By 2013, about half of new retirees were using this feature to file their claims. However, progress stalled after that, despite continued growth in the number of baby boomers who were retiring. A new survey of 2,600 people between ages 57 and 70 finds that even the people who sign up for their benefits online often wind up contacting Social Security for assistance. In the end, only 37 percent of all retirees claim completely online and never visit a field office or call the agency’s 800 number at some point during that process, suggests research by…