As 'Zeshi (the honorific title of Zeami) rokuju igo (after 60 years old)' indicates, the book was to pass Zeami's theory of Noh after he had handed over his position of KANZE dayu to his first son Motomasa KANZE and entered the priesthood when he was 60.
題名に「世子（世阿弥の尊称）六十以後」とあるように、即ち観世大夫の地位を長男の観世元雅に譲り、出家した60歳より後の世阿弥の芸論を伝える書である。