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 break down some of the mutual funds with the top Zacks Mutual Fund Rank and the lowest fees.

American Funds Growth Portfolio R6 (RGWGX) has a 0.02% expense ratio and 0% management fee. RGWGX 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. With yearly returns of 10.41% over the last five years, this fund clearly wins.

Goldman Sachs Large Cap Value Insights I (GCVIX Quick QuoteGCVIX - Free Report) : 0.56% expense ratio and 0.52% management fee. GCVIX is a Large Cap Value mutual fund, which invests in stocks with a market cap of $10 billion of more, but whose share prices do not reflect their intrinsic value. With yearly returns of 11.23% over the last five years, GCVIX is an effectively diversified fund with a long reputation of solidly positive performance.

Pioneer International Value A (PIIFX). Expense ratio: 1.13%. Management fee: 0.65%. Five year annual return: 11.26%. PIIFX is a Non US - Equity fund. Many of these funds like to allocate across emerging and developed markets, and will often focus on all cap levels.

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.