Baby boomers may be the last generation to do as well or better than their parents when it comes to salary and earning power. The trend is heading south. In 1970, 92% of American 30-year-olds earned more than their parents did at a similar age, according to a study at Stanford. By 2014, that number fell to 51% and is still falling economists say. While some millennials are doing very well, most are falling far short of previous generations in terms of earning power. Steve and Sinclair have the Wall Street Journal report.