Jorge: You won' t be able to write well about the rock music of the 1960s, since you were just an infant then. Rock music of the 1960s was created by and for people who were then in their teens and early twenties. Ruth: Your reasoning is absurd. There are living writers who write well about ancient Roman culture, even though those writers are obviously not a part of ancient Roman culture.
The statement 'whether only those people who were in their teens or early twenties during the 1960s can be qualified to write about the rock music of that period' most accurately represents what is at issue between Jorge and Ruth.