At 35. It's well known that human brain development does not end until past 30. Even before scientifically proven, intellectuals and teachers have observed anec

At 35. It's well known that human brain development does not end until past 30. Even before scientifically proven, intellectuals and teachers have observed anecdotes such as that singing only can begun to be mastered around the age 35. From Lilli Lehmann's How to Sing, page 108 (originally authored in the late 1800s): "No woman of less than twenty-four years should sing soubrette parts, none of less than twenty-eight years second parts, and none of less than thirty-five years dramatic parts; that is early enough."