Aimee Kislin wears two guitar picks around her neck from her two great loves.

The black one with the worn-off lettering was a souvenir from “American Idiot,” the Broadway musical she said she attended nearly 146 times before it closed in 2011 after a 13-month run. The newer, orange pick was used onstage in “Once,” another Broadway musical, now in its 12th month at the Bernard B. Jacobs Theater. Ms. Kislin, 30, has seen it 95 times.

“It’s simple and pure — it’s literally the most beautiful thing I’ve ever seen on a stage, hands down,” she said about “Once,” a folksy Irish production. “Every single person in the cast gives 117,000 percent. And they’re so talented, it’s disgusting.”

If Ms. Kislin’s world is any indication of the younger generation of theatergoers, Broadway should be just fine. She saw “Priscilla, Queen of the Desert” 75 times during its 15-month run, and attended “Spring Awakening” 30 times. She is no usher or theater critic, but rather an assistant manager at a Lane Bryant store off Route 3 in Clifton, N.J.

Her life has been a series of obsessions with Broadway shows. Right now, it’s “Once.” On each of her two days off each week, she leaves her apartment in Garfield, N.J., at 4:30 a.m. and takes a bus into Manhattan to be first in line to buy one of the limited $35 rush tickets for that evening’s show. She then waits the 10 hours in Times Square until curtain time.