Investing in mutual funds for retirement is never too late. And the Zacks Mutual Fund Rank can be an excellent tool for investors looking to invest in the best funds.

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.

American Funds Investor Company of America F2 (ICAFX): 0.37% expense ratio and 0.23% management fee. ICAFX is classified as a Large Cap Blend fund. More often than not, Large Cap Blend mutual funds invest in companies with a market cap of over $10 billion. Buying stakes in bigger companies offer these funds more stability, and are well-suited for investors with a "buy and hold" mindset. ICAFX has achieved five-year annual returns of an astounding 15.14%.

AQR Global Equity Fund N (AQGNX Quick QuoteAQGNX - Free Report) : 1.04% expense ratio and 0.6% management fee. AQGNX is a Global - Equity mutual fund. These funds invest in large markets like the U.S., Europe, and Japan, and operate with very few geographical limitations With yearly returns of 15.15% over the last five years, AQGNX is an effectively diversified fund with a long reputation of solidly positive performance.

JHancock Disciplined Value R5 (JDVVX): 0.65% expense ratio and 0.57% management fee. JDVVX is a Large Cap Value mutual fund, which invests in stocks with a market cap of $10 billion of more, but whose share prices do not reflect their intrinsic value. With a five-year annual return of 12.44%, 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.