"What happens if you don't die when the tables say you should but end up living another decade...or two? What happens if shortly after you retire the stock market decides to start over at its 2008 levels? What happens if you get hit by a bus the day after you retire, and you require round-the-clock nursing for the foreseeable future? ... Here are some things you can do to calamity-proof your plan for early retirement[.]"