According to that record, Rikyu inherited the traditional style of tea ceremony until he was 60, and began to establish his own style after 61 (when the incident at Honno-ji Temple occurred).
この書によると、利休は60歳までは先人の茶を踏襲し61歳から（つまり本能寺の変の年から）ようやく独自の茶の湯を始めたという。