This is a point of disagreement. Jorge thinks being of those ages is required to write about rock music from the 1960s. Ruth doesn’t think so.

Not a point of disagreement. Jorge thinks being those ages is required to write well about rock music of the 1960s. Ruth doesn’t think age prevents one from writing well about music from a different time period. We have no reason to think there’s disagreement about this answer.

Jorge doesn’t express an opinion. He doesn’t comment on ancient cultures or what’s required to write well about those cultures.

Not a point of disagreement. Jorge thinks one had to be in their teens or twenties during the 1960s to write well about 1960s rock. But an older person today who was of those ages in 1960s might write well. Ruth agrees that age doesn’t prevent one from writing well.

Neither expresses an opinion. Nobody discusses the appeal of Ruth’s ideas about anything. Although they comment about writing well, that’s not necessarily the same as having appealing ideas.