It is never too late to invest in mutual funds for retirement. As such, if you plan to invest in some of the best funds, the Zacks Mutual Fund Rank can provide you with valuable guidance.

The easiest, most reliable way to judge a mutual fund's quality over time is by analyzing its performance, diversification, and fees. The Zacks Mutual Fund Rank, which covers over 19,000 mutual funds, has helped us identify three outstanding options that are perfect for any long-term investors' portfolios that is retirement-focused.

Let's take a look at some of our top-ranked mutual funds with the lowest fees.

DFA US Hi Relatv Profitability Inst (DURPX Quick QuoteDURPX - Free Report) : 0.22% expense ratio and 0.19% management fee. DURPX is part of the Large Cap Blend section, and these mutual funds most often invest in firms with a market capitalization of $10 billion or more. By investing in bigger companies, these funds offer more stability, and are often well-suited for investors with a "buy and hold" mindset. DURPX has achieved five-year annual returns of an astounding 10.02%.

Fidelity Select Health Care Services (FSHCX Quick QuoteFSHCX - Free Report) . Expense ratio: 0.71%. Management fee: 0.52%. FSHCX is part of the Sector - Health category, offering investors a focus on the healthcare industry, one of the largest sectors in the American economy. This fund has managed to produce a robust 14.46% over the last five years.

Dreyfus Fund (DREVX Quick QuoteDREVX - Free Report) : 0.71% expense ratio and 0.65% management fee. DREVX is a part of the Large Cap Growth mutual fund category, which invest in many large U.S. companies that are expected to grow much faster compared to other large-cap stocks. With a five-year annual return of 10.65%, this fund is a well-diversified fund with a long track record of success.

There you have it. If your financial advisor had you put your money into any of our top-ranked funds, then they've got you covered. If not, you may need to talk.