We’ve all seen reports that Barack Obama’s job approval rating has recently fallen below 50 percent in the Gallup poll for the first time since the president took office in January. A look inside those numbers — Gallup publishes a weekly breakdown of its results by demographic groups — shows that there are a lot of other firsts in the polling:

Among age groups: For the first time in the White House, Obama is below 50 percent with every age group of Americans except those between 18 and 29. He’s at 48 percent with people in the 30-49 range; 46 percent with people in the 50-64 range; and 42 percent with people 65 and over. Among those 18-29, he’s at 61 percent.