The funds in our "Magnificent Retirement Mutual Funds" list are among the best managed and best performing mutual funds available. If you are just finding out about our Top-Ranked Funds list, we welcome you!

The easiest, most reliable way to judge a mutual fund's quality over time is by analyzing its performance, diversification, and fees. Our Zacks Rank 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.

Here are the funds that have achieved the #1 (Strong Buy) Zacks Rank and have low fees.

Principal Large Cap Growth I R4 (PPUSX): 0.97% expense ratio and 0.6% management fee. PPUSX 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. With annual returns of 13.21% over the last five years, this fund is a winner.

MassMutual Select Mid Cap Growth R5 (MGRFX): 0.81% expense ratio and 0.68% management fee. MGRFX is a Mid Cap Growth mutual fund. These funds aim to target companies with a market capitalization between $2 billion and $10 billion that are also expected to exhibit more extensive growth opportunities for investors than their peers. With yearly returns of 10.86% over the last five years, MGRFX is an effectively diversified fund with a long reputation of solidly positive performance.

Victory RS Science&Technology Y (RIFYX): 1.24% expense ratio and 1% management fee. With a much more diversified approach, RIFYX--part of the Sector - Tech mutual fund category--gives investors a way to own a stake in the notoriously risky tech sector. With a five-year annual return of 22.92%, this fund is a well-diversified fund with a long track record of success.

We hope that your investment advisor (if you use one) has you invested in one or all of the top-ranked mutual funds we've reviewed. But if that isn't the case, it might be time to have a conversation or reconsider this vitally important relationship.

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