Older voters and younger voters used to be largely on the same page when they went to the polls. No more.

Gallup released two reports about the split this week. The first was called “U.S. Seniors Have Realigned With the Republican Party,” and the second was “Young Americans’ Affinity for Democratic Party Has Grown.”

The numbers were striking. Until the age of Obama, Democrats had an ideological leg up among Americans 65 and older. Then those voters shifted to give the Republicans an advantage. That advantage has held, although it’s shrinking.

On the other end of the spectrum, Republicans haven’t held an ideological advantage among Americans ages 18-29 since 1995. But for a decade, the Republican deficit was always 13 points or less. That changed in 2006 when the Democrats won control of the House and the Senate and a majority of governorships and state legislatures. This was, in part, due to George W. Bush’s sinking poll numbers and rising opposition to the ongoing wars in Afghanistan and, particularly, in Iraq. The Democratic advantage among young people since then has been 13 points or more.