Social Security is the world's biggest and most government-funded Ponzi scheme in history. It literally requires the population to perpetually remain a sharp pyramid, with vastly more youthful workers feeding the fund than retirees draining it, while also requiring inflation to stay at 0% in order for the money put in to match with the money that would later be taken out.

At no point in human history could it ever function as originally described. At best, it's constantly stealing money from the young to give a tiny stipend to the old. At worst, it's nothing more than a giant slush fund to be frivolously used/abused by any politician who even glances in its general direction for more than 2 seconds.