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.

How can you tell a good mutual fund from a bad one? It's pretty basic: if the fund is diversified, has low fees, and shows strong performance, it's a keeper. Of course, there's a wide range, but using the Zacks Mutual Fund Rank, we've found three mutual funds that would be great additions to any long-term retirement investors' portfolios.

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

Fidelity Advisor Growth Opportunit (FAOFX Quick QuoteFAOFX - Free Report) : 0.01% expense ratio and 0% management fee. FAOFX 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. FAOFX has achieved five-year annual returns of an astounding 16%.

Janus Henderson Global Technology Institutional (JGLTX Quick QuoteJGLTX - Free Report) : 0.72% expense ratio and 0.64% management fee. JGLTX is part of the Sector - Tech mutual fund category that invests in technology and lets investors own a stake in a notoriously volatile sector, but with a much more diversified approach. JGLTX, with annual returns of 10.8% over the last five years, is a well-diversified fund with a long track record of success.

Lord Abbett Micro Cap Growth I (LMIYX Quick QuoteLMIYX - Free Report) : 1.14% expense ratio and 0.9% management fee. LMIYX is a Small Cap Growth mutual fund building their portfolio around stocks with market caps under $2 billion and large growth opportunities. The fund is mainly invested in equities, has a long reputation of salutary performance, and has yearly returns of 15.1% 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.