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.

Fiera Capital Sm/Mid-Cap Grwth Inst (APSGX Quick QuoteAPSGX - Free Report) has a 1.05% expense ratio and 0.9% management fee. APSGX is a Mid Cap Growth mutual fund. Mid Cap Growth funds pick stocks--usually companies with a market cap between $2 billion and $10 billion--that demonstrate extensive growth opportunities for investors compared to their peers. With yearly returns of 11.05% over the last five years, this fund clearly wins.

Fidelity Advisor Semiconductors A (FELAX Quick QuoteFELAX - Free Report) . Expense ratio: 1.01%. Management fee: 0.52%. FELAX is a Sector - Tech mutual fund, allowing investors to own a stake in a notoriously volatile sector with a much more diversified approach. This fund has managed to produce a robust 15.26% over the last five years.

T. Rowe Price New America Growth Adviser (PAWAX Quick QuotePAWAX - Free Report) : 1.07% expense ratio and 0.63% management fee. PAWAX 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 14.01% 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.