Investing in mutual funds for retirement is never too late. And the Zacks Mutual Fund Rank can be an excellent tool for investors looking to invest in the best funds.

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.

Fidelity Trend Fund (FTRNX Quick QuoteFTRNX - Free Report) : 0.55% expense ratio and 0.41% management fee. FTRNX 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 annual returns of 15.44% over the last five years, this fund is a winner.

JPMorgan US Equity I (JUESX Quick QuoteJUESX - Free Report) is a stand out amongst its peers. JUESX 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 five-year annualized performance of 13.61%, expense ratio of 0.69% and management fee of 0.4%, this diversified fund is an attractive buy with a strong history of performance.

MFS Mass Investors Growth Stock R1 (MIGMX Quick QuoteMIGMX - Free Report) : 1.46% expense ratio and 0.33% management fee. MIGMX is a Large Cap Growth mutual fund, and these funds invest in many large U.S. firms that are projected to grow at a faster rate than their large-cap peers. The fund is mainly invested in equities, has a long reputation of salutary performance, and has yearly returns of 13.24% over the last five years.

These examples highlight the fact that there are some astonishingly good mutual funds out there. If your advisor has you in the good ones, bravo! If not, you may need to have a talk.