While not much of a surprise given extended life expectancy statistics, many of the investors polled are grappling with the challenges of retirement planning. Only one-in-five expects to spend more than 25 years living in retirement—despite the fact that a healthy couple aged 65 in the U.S. today has a 50% chance that at least one of them will live to the age of 92.1
"Funding a comfortable retirement" came up as one of the biggest financial priorities for U.S. investors, however, there's a gap between retirement goals and investor confidence in achieving them. In helping to meet these challenges, U.S. retirees have amassed a wealth of knowledge over the course of a lifetime of saving and investing. This knowledge forms the basis of a range of recommendations that focus not only on the need to save more, but also the need—and possibly the positive desire—to keep working beyond normal retirement age. Here are the top four retirement regrets from retirees.