There is never a wrong time to invest in mutual funds for retirement. So, if you're still looking for the best mutual funds, the Zacks Mutual Fund Rank can be a great guide.

The best way to shortlist great mutual funds is to ensure solid performance, diversification, and low fees. Some are better than others, but utilizing the Zacks Mutual Fund Rank, we have identified three mutual funds that could be solid additions to one's retirement portfolio.

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

AB Lg Cap Growth Z (APGZX Quick QuoteAPGZX - Free Report) : 0.51% expense ratio and 0.48% management fee. APGZX is a Large Cap Growth option; these mutual funds purchase stakes in numerous large U.S. companies that are expected to develop and grow at a faster rate than other large-cap stocks. With annual returns of 13.91% over the last five years, this fund is a winner.

VALIC Company I Mid Cap Strategic Growth (VMSGX Quick QuoteVMSGX - Free Report) : 0.78% expense ratio and 0.64% management fee. VMSGX 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. VMSGX, with annual returns of 11.1% over the last five years, is a well-diversified fund with a long track record of success.

Principal Capital Appreciation A (CMNWX Quick QuoteCMNWX - Free Report) : 0.77% expense ratio and 0.44% management fee. CMNWX 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. The fund is mainly invested in equities, has a long reputation of salutary performance, and has yearly returns of 12.36% over the last five years.

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.