I was playing one of my morning online word puzzles when up popped a little blurb from a senior citizen advocacy group announcing that the Supplemental Security Income program has recently turned 50 years old. I’m sure most people who see a reference to SSI would say something like “Supplemental Security what?” And that’s because SSI is not very well known to most people. And as I’ve pointed out umpteen times, a lot of folks probably just figure, given its name, that Supplemental Security Income is some kind of supplemental Social Security benefit. It is not. So, I guess it’s time to dust off and update some of the columns I’ve written in the past that explain the SSI program….