There is never a wrong time to invest in mutual funds for retirement. So, if you're still looking for the best mutual funds, the Zacks Mutual Fund Rank can be a great guide.

The best way to shortlist great mutual funds is to ensure solid performance, diversification, and low fees. Some are better than others, but utilizing the Zacks Mutual Fund Rank, we have identified three mutual funds that could be solid additions to one's retirement portfolio.

Let's take a look at some of our top-ranked mutual funds with the lowest fees.

JPMorgan Growth Advantage A (VHIAX Quick QuoteVHIAX - Free Report) : 1.04% expense ratio and 0.55% management fee. VHIAX 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 19.86% over the last five years, this fund is a winner.

Putnam Global Health Care A (PHSTX Quick QuotePHSTX - Free Report) is a stand out amongst its peers. PHSTX 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 five-year annualized performance of 13.38%, expense ratio of 1.07% and management fee of 0.62%, this diversified fund is an attractive buy with a strong history of performance.

MassMutual Select Mid Cap Value R5 (MLUSX Quick QuoteMLUSX - Free Report) . Expense ratio: 0.71%. Management fee: 0.7%. Five year annual return: 10.68%. MLUSX is a Mid Cap Value fund, which usually invests in companies with a stock market valuation between $2 billion and $10 billion.

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.