It's a nice correlation, but are you sure there aren't important confounding variables? Primarily: the youngest person auditioning for a top orchestra in 1970

It's a nice correlation, but are you sure there aren't important confounding variables? Primarily: the youngest person auditioning for a top orchestra in 1970 was a teenager in the late 50's, when the female role model was the stay-at-home mother. A person first auditioning ten years later was a teenager in the late '60s, when the female role model was going through a revolution.