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 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 Large Cap Growth K (ALCKX Quick QuoteALCKX - Free Report) : 0.94% expense ratio and 0.48% management fee. ALCKX 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. ALCKX has achieved five-year annual returns of an astounding 12.65%.

Deutsche Science and Technology S (KTCSX Quick QuoteKTCSX - Free Report) : 0.71% expense ratio and 0.45% management fee. KTCSX is a Sector - Tech mutual fund, allowing investors to own a stake in a notoriously volatile sector with a much more diversified approach. KTCSX, with annual returns of 13.55% over the last five years, is a well-diversified fund with a long track record of success.

State Street Institutional US Equity Services (SUSSX Quick QuoteSUSSX - Free Report) : 0.63% expense ratio and 0.37% management fee. SUSSX is a Large Cap Blend fund, targeting companies with market caps of over $10 billion. These funds offer investors a stability, and are perfect for people with a "buy and hold" mindset. With a five-year annual return of 11.59%, this fund is a well-diversified fund with a long track record of success.

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.