Despite the challenges many Americans face in setting aside enough money to finance their golden years, experts say the retirement system is not a lost cause. But a few improvements—many already in the workscould make a big difference for savers.

It's not surprising that retirement—specifically, not having enough money to retire—is Americans' top financial concern, according to a 2014 Gallup poll. As the burden of saving for retirement has shifted from employers to workers, many are falling short. At the end of 2013, the median 401(k) account balance was just $18,433, according to the Employee Benefit Research Institute. Fees are eating into those meager balances—to the tune of as much as $17 billion a year, according to a recent report from the White House. Then after retirement, there's little guidance for savers to determine how to draw down accounts to stretch that nest egg.