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 way to judge a mutual fund's quality over time is by analyzing its performance, diversification, and fees. Using the Zacks Mutual Fund Rank of over 19,000 mutual funds, we've identified three outstanding mutual funds that are ideally suited to help long-term investors pursue and achieve their retirement investing goals.

Here are the funds that have achieved the Zacks Mutual Fund Rank #1 (Strong Buy) and have low fees.

T. Rowe Price Capital Opportunity A (PACOX Quick QuotePACOX - Free Report) : 0.81% expense ratio and 0.32% management fee. PACOX 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. PACOX has achieved five-year annual returns of an astounding 11.5%.

Rydex Nova H (RYNHX Quick QuoteRYNHX - Free Report) : 1.48% expense ratio and 0.75% management fee. RYNHX 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. RYNHX, with annual returns of 12.96% over the last five years, is a well-diversified fund with a long track record of success.

BNY Mellon Natural Resources A (DNLAX Quick QuoteDNLAX - Free Report) : 1.13% expense ratio and 0.75% management fee. DNLAX is a Sector - Energy mutual fund, which encompasses a wide range of vastly changing and vitally important industries throughout this massive global sector. With a five-year annual return of 15.35%, 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.