Although U.S. Social Security payments currently count as a significant source of income for 50% of retired Americans, changing demographics--retiring Baby Boomers with longer life spans, earlier retirements, fewer workers per retiree--means that there will soon be a very large gap in what the U.S. government collects from taxes and what it promises to pay out to retired citizens. Learn all about Social Security and what you're entitled to, so that you can maximize your rightfully earned benefits.