The MFS Lifetime Retirement Income Fund Class R4 (MLLJX) is a mutual fund that aims to provide investors with a steady stream of income during their retirement years. This fund is managed by MFS Investment Management and is designed to help investors achieve their long-term financial goals. With a focus on income generation, the fund invests in a diversified portfolio of stocks, bonds, and other income-producing assets. The Class R4 shares of this fund have a lower expense ratio compared to other share classes, making it an attractive option for investors looking for a cost-effective way to generate retirement income.