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.

Let's learn about some of Zacks' highest ranked mutual funds with low fees you may want to consider.

If you are looking to diversify your portfolio, consider T. Rowe Price New Era I (TRNEX). TRNEX is a Sector - Energy mutual fund, which encompasses a wide range of vastly changing and vitally important industries throughout this massive global sector. This fund is a winner, boasting an expense ratio of 0.57%, management fee of 0.53%, and a five-year annualized return track record of 14.03%.

Fidelity Select Banking (FSRBX Quick QuoteFSRBX - Free Report) . Expense ratio: 0.7%. Management fee: 0.67%. FSRBX is a Sector - Finance fund. The financial space is notoriously large, complex, and heavily-regulated, and these funds give investors a stable, diversified approach to investing in this industry. This fund has managed to produce a robust 11.45% over the last five years.

Thornburg Global Opportunities R6 (THOGX): 0.85% expense ratio and 0.83% management fee. THOGX is a Global - Equity mutual fund investing in bigger markets like the U.S., Europe, and Japan; these kinds of funds aren't limited by geography. With a five-year annual return of 15.21%, 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.