All of us have grown up understanding the concept of retirement. The notion is very simple – we work, we save, and then we stop working and enjoy a whole lot of free time during which we take care of grandchildren, golf, knit, travel, or all of the above. But as indicated by Kiplinger, hundreds of years ago, most people didn’t grow old so there was no need to retire. People often worked to survive until they were simply unable to work any longer...