The concept of retirement has changed drastically over the course of the past few decades. It seems that the classic concept of leaving work to sit at home living off a pension has evolved to say the least and you may be surprised to learn some of the reasons why. Well, to start with, we all know the that national and international business and financial systems have become frail to the point that people can just no longer count on a “guaranteed” pension to be there when it's needed like they used to.