Polling shows — despite winning roughly three-in-five voters under age 30 — Biden’s approval rating slipping below 50 percent among the youngest segment of the electorate. That includes a new Harvard Youth Poll released Wednesday that pegs Biden at 46 percent approval among Americans aged 18 to 29, compared to 51 percent who disapprove.

It’s a 13-point drop for Biden from March, when 59 percent of young Americans approved of the job Biden was doing.

The slippage is consistent with other polling, which portrays an across-the-board polling rut for the president. And it’s a warning sign ahead of next year’s midterm elections, when Democrats will be trying to convince younger voters — who are more likely to sit out non-presidential elections — to show up at the polls.