JACK TARRANT and HIDETO SAKAI  HIROMU Inada, 87, already has a certificate on his wall that confirms his status as the world's oldest Ironman, but the Japanese man is still pounding away on his training bike and hopes to continue competing into his 90s. In 2018 at the age of 85 years and 328 days, Inada went to Kailua-Kona in Hawaii and set a new mark for the oldest person to complete the world championship Ironman - a feat beyond most people decades younger than him. The cancellation of this October's Ironman because of the coronavirus pandemic has not dulled…