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.

Marsico Global Fund (MGLBX) has a 1.34% expense ratio and 0.78% management fee. MGLBX 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 12.29% over the last five years, this fund clearly wins.

T. Rowe Price New Era (PRNEX): 0.79% expense ratio and 0.53% management fee. PRNEX is a Sector - Energy mutual fund, which encompasses a wide range of vastly changing and vitally important industries throughout this massive global sector. PRNEX, with annual returns of 13.66% over the last five years, is a well-diversified fund with a long track record of success.

Hartford Schroder Intl Multi Val R4 (HFYSX Quick QuoteHFYSX - Free Report) is an attractive large-cap allocation. HFYSX is a Non US - Equity option, focusing their investments acoss emerging and developed markets, and can often extend across cap levels too. HFYSX has an expense ratio of 1.16%, management fee of 0.7%, and annual returns of 13.24% over the past five years.

We hope that your investment advisor (if you use one) has you invested in one or all of the top-ranked mutual funds we've reviewed. But if that isn't the case, it might be time to have a conversation or reconsider this vitally important relationship.