TEXT: TO GO WITH AFP STORY BY ALASTAIR HIMMER In this picture taken on June 22, 2015, an elderly women troupe of singers and dancers from Kohama Island in Okinawa wearing traditional local costumes perform at a herb garden on Kohama Island, Okinawa Prefecture. They joke about knocking on heaven's door, but a Japanese 'girl band' named KBG84, with an average age of 84 have struck a blow for grannies everywhere by becoming pop idols. AFP PHOTO / Toru YAMANAKA        (Photo credit should read TORU YAMANAKA/AFP/Getty Images)