Dr. Marc Wallack and his new wife, Cynthia Zhou, were just out of earshot up the sandy stairs to the Westhampton Bath and Tennis Hotel on their way to their wedding reception when the violinist who played their processional struck up the Beatles’ “When I’m 64.”

The 126 wedding guests, who filed after the couple into a grand white tent roughly 100 steps from the shore, may have been too focused on navigating sand in their dress-up shoes to notice the cheekiness of the song lyrics. (Will you still need me, will you still feed me, when I’m 64?) But Dr. Wallack, 72, and Ms. Zhou, 27, would have understood.

A week before the July 30 wedding, Ms. Zhou faced the topic head-on in a conference room at Wolters Kluwer, an information services company in Manhattan, where she is a summer intern. “Let’s face it,” she said. “Our age difference is the elephant in the room.”

She is equipped to confront the elephant, she said. She noted that people have accepted the marriages of interracial couples and gay couples, and they should accept the weddings of spouses with big age differences, too.