With more than $7 trillion in client funds under management, investment giant Vanguard is a force to be reckoned with. Unlike some deep-pocketed hedge funds or exclusive Wall Street firms, it's important to remember that this asset manager got to where it is with a very populist approach to investing — namely, low-cost index funds that help regular folks grow their retirement funds in the long term. If you're currently in or approaching retirement, Vanguard's family of exchange-traded funds has a lot to offer you in both preserving your hard-earned savings and ensuring this cash continues to grow.