Gerontology is not only an interdisciplinary and intra disciplinary study,but also an international and inter-professional study.Gerontology is a study to create awareness on the concept among people,throughout the world.The philosophy of Gerontology is a lively active philosophy to explore the nature of humanity itself and to practice learning.Moreover,Gerontology is considered as a science as well as human philosophy.This paper introduces philosophy of Gerontology in Japan from the past to the present.It explains that Zen has fundamental philosophy of Gerontology.