Are you behind on saving for retirement? Even if you don’t know what counts as “behind,” you’re likely to need to step up your efforts to build your nest egg. A June 2015 Government Accountability Office analysis found that that average Americans between the ages of 55 and 64 have accrued about $104,000 in retirement savings. Sound like a lot? Not when you realize that sum would translate into a $310 monthly payment if your money were invested in a lifetime annuity.