Spending uncertainty

I see so few articles on spending uncertainty that I thought I'd pass this along:

Where Retirees Underestimate Spending - Underestimating how much you’ll spend can be costly, so it’s key to know the common pitfalls.  WSJ Journal Reports: Retirement. 

Navigating retirement can be difficult for lots of reasons. One of the biggest is that it forces people to make plans based on spending assumptions that won’t become a reality for decades. Guessing wrong can be the difference between a comfortable retirement and one that is a struggle....One of the biggest mistakes people make in estimating retirement expenses is underestimating how long they will live....“Everybody worries about dying young,” says Prof. David Littell of the American College of Financial Services. “People should be more worried about living too long.”