T. Rowe Price Retirement 2020 Fund 

This fund primarily allocates its investments across a diverse selection of T. Rowe Price's own stock and bond mutual funds, covering a wide array of asset classes and market sectors. The underlying blend of these mutual funds is not static; it is strategically rebalanced over time as the fund approaches its specific retirement horizon. Its investment approach is precisely calibrated to the 2020 target retirement year, as indicated in its name, and operates on the premise of an investor retiring at age 65.