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 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.

Empower Mid Cap Value Inv (MXMVX Quick QuoteMXMVX - Free Report) : 1.05% expense ratio and 0.67% management fee. MXMVX is a Mid Cap Value mutual funds that aims to target medium-sized companies that possess strong value and income opportunities for investors. With annual returns of 10.97% over the last five years, this fund is a winner.

T. Rowe Price Blue Chip Growth R (RRBGX): 1.23% expense ratio and 0.55% management fee. RRBGX 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. With yearly returns of 11.12% over the last five years, RRBGX is an effectively diversified fund with a long reputation of solidly positive performance.

Victory Pioneer Global Equity Y (PGSYX): 0.75% expense ratio and 0.65% management fee. PGSYX is a Global - Equity mutual fund investing in bigger markets like the U.S., Europe, and Japan; these kinds of funds aren't limited by geography. The fund is mainly invested in equities, has a long reputation of salutary performance, and has yearly returns of 15.85% over the last five years.

These examples highlight the fact that there are some astonishingly good mutual funds out there. If your advisor has you in the good ones, bravo! If not, you may need to have a talk.