President Biden's reluctance to acknowledge his physical limitations at age 81 is causing some tension on his team, as senior aides and First Lady Jill Biden push him to rest more and be vigilant about his health going into 2024.

Why it matters: Current and former aides say Biden is extraordinarily energetic for his age. But his repeated insistence that he feels so young can draw eye rolls: Some current and former aides believe Biden doesn't realize how old he can come across.

In conversations with aides and friends, Biden frequently says some version of: "I feel so much younger than my age."
Managing Biden's schedule and energy has become crucial to his re-election campaign, given widespread voter concerns about his ability to do the job until January 2029, when he'll be 86.
Zoom in: Current and former Biden aides say he often pushes to do more travel and events than they think he should.

Biden pushing up against his limits sometimes creates a cycle in which he wears himself out, then appears fatigued during public events — which can increase concerns about his age, even when he's taking on a rigorous schedule.
"He is his own worst enemy when it comes to his schedule," a former Biden aide said.
Jill Biden and her team are deeply involved in the president's day-to-day schedule.