With the lowering in the age of becoming Sanji kentai holder as well as the shortening of terms in office became apparent during the Kamakura period, an extreme case occurred where a person became Sanji kentai holder at the age of nineteen and was in office for a month and Sanji kentai gradually became the one that didn't represent the actual situation.
鎌倉期になると低年齢化と在職期間の短縮が進み、19歳で就任・在職期間一ヶ月という例まで現れ、実態とはかけ離れていく。