Everything seemed to be going well for future retirees a few years back. The economy was stable, the stock market was riding high and assets in 401(k) defined-contribution plans were galloping in value. Participants boasted about being able to retire at age 60, an almost quaint recollection now, since they’re still at their desks, wondering what went wrong. Employers that sponsor these plans are wondering the same thing. Workers who can’t retire for financial reasons and hang on to their jobs for longer than their employers would like aren’t easy to shed.