Millennials outnumber Boomers by 11 million, partly because of immigration. Fifty-seven percent are white, versus 72% of boomers and 61% of Gen-X. Twenty-seven percent will never marry because it's not important to them, and the average age of marriage among the demographic is 29. And the gap between income levels of college-degree holders versus people without a college degree is widening. But college debt has quadrupled.