80 > 50 (0.2% > 43%)

New data from the Internal Revenue Service show just how old the top millionaires and billionaires in the U.S. are. While people over 80 make up only 3.7 percent of the population, the IRS estimates they control a larger share of the nation's top fortunes than people under 50.

The latest study, released this month and estimating personal wealth in 2013, finds 584,000 Americans, or about 0.2 percent of the U.S. population, with a combined net worth of $6.9 trillion. People in their 80s and 90s control $1.2 trillion of that wealth. Adults under 50, roughly 43 percent of the population, hold barely $1 trillion.