Dwayne Dopsie remembers his 2024 performance with the Rolling Stones.

With broad shoulders, big biceps and a boyish face, Dwayne Dopsie resembles a New Orleans Saints linebacker more than a zydeco accordionist. Dopsie, 46, says his physique reflects good health he’s maintained since the age of nine or 10.

He follows Creole home remedies learned from his late parents; “Crowned Prince of Zydeco” Rockin’ Dopsie an...