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, most reliable way to judge a mutual fund's quality over time is by analyzing its performance, diversification, and fees. The Zacks Mutual Fund Rank, which covers over 19,000 mutual funds, has helped us identify three outstanding options that are perfect for any long-term investors' portfolios that is retirement-focused.

Let's learn about some of Zacks' highest ranked mutual funds with low fees you may want to consider.

Franklin Biotechnology Discovery Advisor (FTDZX) has a 0.76% expense ratio and 0.61% management fee. FTDZX is part of the Sector - Health category, offering investors a focus on the healthcare industry, one of the largest sectors in the American economy. With yearly returns of 12.09% over the last five years, this fund clearly wins.

Allspring Discipl US Core A (EVSAX): 0.83% expense ratio and 0.35% management fee. EVSAX 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. EVSAX, with annual returns of 13.91% over the last five years, is a well-diversified fund with a long track record of success.

MFS Blended Research Intl Eq C (BRXCX Quick QuoteBRXCX - Free Report) is an attractive large-cap allocation. BRXCX is a part of the Non US - Equity fund category, many of which will focus across all cap levels, and will typically allocate their investments between emerging and developed markets. BRXCX has an expense ratio of 1.49%, management fee of 0.35%, and annual returns of 11.94% over the past 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.