There is never a wrong time to invest in mutual funds for retirement. So, if you're still looking for the best mutual funds, the Zacks Mutual Fund Rank can be a great guide.

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.

JPMorgan Developed Intl Value C (JIUCX): 1.49% expense ratio and 0.55% management fee. JIUCX is a Non US - Equity option, focusing their investments acoss emerging and developed markets, and can often extend across cap levels too. With annual returns of 14.57% over the last five years, this fund is a winner.

Baron Durable Advantage R6 (BDAUX Quick QuoteBDAUX - Free Report) : 0.7% expense ratio and 0.65% management fee. BDAUX 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. BDAUX, with annual returns of 13.72% over the last five years, is a well-diversified fund with a long track record of success.

GMO International Equity Allocation III (GIEAX) is an attractive large-cap allocation. GIEAX is classified as an Allocation Balanced fund, which seeks to invest in a balance of asset types, like stocks, bonds, and cash, and including precious metals or commodities is not unusual. GIEAX has an expense ratio of 0.01%, management fee of 0%, and annual returns of 12.18% over the past 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.