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

Janus Henderson Global Life Science S (JFNSX Quick QuoteJFNSX - Free Report) has a 1.18% expense ratio and 0.64% management fee. JFNSX is classified as a Sector - Health fund. Healthcare is one of the biggest sectors of the American economy, and these kinds of mutual funds provide a great opportunity to invest in this industry. With yearly returns of 9.98% over the last five years, this fund clearly wins.

Fidelity Series Growth & Income (FGLGX Quick QuoteFGLGX - Free Report) : 0.63% expense ratio and 0% management fee. FGLGX 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 10.84% over the last five years, FGLGX is an effectively diversified fund with a long reputation of solidly positive performance.

MFS Mass Investors Growth Stock C (MIGDX Quick QuoteMIGDX - Free Report) : 1.46% expense ratio and 0.33% management fee. MIGDX is a part of the Large Cap Growth mutual fund category, which invest in many large U.S. companies that are expected to grow much faster compared to other large-cap stocks. The fund is mainly invested in equities, has a long reputation of salutary performance, and has yearly returns of 12.21% 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.