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 take a look at some of our top-ranked mutual funds with the lowest fees.

T. Rowe Price Capital Opportunity R (RRCOX Quick QuoteRRCOX - Free Report) has a 1.14% expense ratio and 0.32% management fee. RRCOX is classified as a Large Cap Blend fund. More often than not, Large Cap Blend mutual funds invest in companies with a market cap of over $10 billion. Buying stakes in bigger companies offer these funds more stability, and are well-suited for investors with a "buy and hold" mindset. With yearly returns of 11.2% over the last five years, this fund clearly wins.

AMG Frontier Small Cap Growth Z (MSSYX Quick QuoteMSSYX - Free Report) : 0.9% expense ratio and 0.7% management fee. MSSYX is one of many Small Cap Growth mutual funds; these funds tend to create their portfolios around stocks with market capitalization of less than $2 billion. With yearly returns of 14.46% over the last five years, MSSYX is an effectively diversified fund with a long reputation of solidly positive performance.

Goldman Sachs Large Cap Growth Insights IR (GLCTX Quick QuoteGLCTX - Free Report) : 0.67% expense ratio and 0.5% management fee. GLCTX 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 12.12% 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.