An unlikely new group has emerged onto Japan's "Idol scene". With an average age of 84, the members of KBG84 are from the small Okinawan island of Kohama. Wearing headbands, the group excites crowds with their dynamic singing and dancing. Their concerts in Tokyo and Osaka were sold out. And in December 2016, they expanded overseas! Media Corp, the Singaporean TV company found Grandmas' singing on Youtube, and invited them for a concert! They want to discover "Why are these Grandmas so full of vitality?" This program looks at their way of life and find clues for the beautiful life in old age.