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, 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.

Invesco Small Cap Value A (VSCAX): 1.05% expense ratio and 0.63% management fee. VSCAX is a Small Cap Value mutual fund option, which typically invest in companies with market caps under $2 billion. With annual returns of 18.83% over the last five years, this fund is a winner.

JHancock US Growth R4 (JHSGX). Expense ratio: 0.84%. Management fee: 0.55%. JHSGX 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. This fund has managed to produce a robust 15.3% over the last five years.

Goldman Sachs Intl Eq Insights P (GGFPX Quick QuoteGGFPX - Free Report) . Expense ratio: 0.78%. Management fee: 0.75%. Five year annual return: 11.53%. GGFPX 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.

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.