“Target date” funds, which gradually shift their exposures from higher-risk assets such as stocks to lower-risk assets such as bonds as their investors’ target retirement date approaches, have proliferated in recent years. (These are the funds whose names typically include a year, such as the “Fidelity Freedom 2045 Fund”.) According to Morningstar, more than $500 billion is invested in these funds. So should you put your retirement savings into a target date fund? Like many questions relating to managing your wealth, there’s no one-size-fits-all answer: it depends on your investing preferences.