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“I think it does matter,” added Mr. Horner, who said he had not picked a candidate yet.

Others acknowledged that age was an issue, but not the pre-eminent one.

“Would I prefer someone who is younger? Yes, but it’s not our top thing,” Elizabeth Bennett, 54, said at a gun safety forum in Las Vegas.

On the campaign trail, each of the three septuagenarian Democrats has sought to project an image of good health, with Ms. Warren making a point to jog to the stage of her campaign events and Mr. Biden running through parades.

The onetime captain of his high school track team, Mr. Sanders has done the same. He has pursued a blistering campaign schedule often characterized by multiple stops a day, and has been loath to take time off from the trail. He pitched in the softball game his campaign staged over the summer on Iowa’s “Field of Dreams,” and his aides have released other images of him playing catch or basketball.

Mr. Sanders’s events are usually high-energy affairs, where he regales enthusiastic crowds with his calls for “Medicare for all” and rails against the corporate and Washington elite.

In recent weeks, he has struggled with hoarseness, which forced him to cancel several events last month, but he then returned to the campaign trail. In March, he hit his head on the edge of a glass shower door, requiring seven stitches.

The Sanders campaign had planned to go on air with his first television ads of the campaign this week in Iowa, announcing a two-week $1.3 million buy on Tuesday. His campaign said on Wednesday that it was postponing those ads.