Some Older Voters Shift to Biden in Florida. Will It Be Enough for Him?

“People aren’t divulging necessarily who they’re going to vote for,” Ms. Roeder said. That morning at the eye doctor, she had seen another patient with a Biden-Harris baseball cap.

“I said to him, ‘I like your cap,’” she said. “And then someone said to him, ‘I like it, too.’”

The excitement is even more palpable, however, among Republicans.

Last week, Ivanka Trump, the president’s daughter and senior adviser, rallied supporters at an outdoor venue just east of Interstate 75 in Lee County. Thrilled fans left with big smiles, posing for photographs and gabbing with other attendees. Only some wore masks. Almost all said they had no qualms about how the president handled the pandemic.

“I just like the energy of this crowd,” said Gail Mount, 68, of Port Charlotte. “They’re just very upbeat people.”

At the Republican Party headquarters in Fort Myers, nestled in a strip mall between a pizza place and an escape room, Doris Cortese, the party’s 81-year-old vice chairwoman, sported a red, white and blue manicure with the letters T-R-U-M-P spelled out on her nails.

Ms. Cortese said people of all ages had volunteered — “We’re getting millennials!” she said — and predicted that retiree support for Mr. Trump would grow, not diminish.

“I’m in the office four days a week, and we’re getting more and more seniors,” she said. “The fact that Trump is going to lower prescription prices” — a goal he touted in Fort Myers this month — “that’s a big one with seniors, because some of them almost have to make a choice between eating and having their medicine.”