Koide was born in Tsuruga, Japan on March 13, 1903, where he worked as a tailor, and worked in the field and was able to ride a tricycle until age 105 when he got a heatstroke and his only ambulance service, but besides that he had never been seriously ill. At age 107, Koide moved to Nagoya to live with his daughter. He had in total 7 children, 9 grandchildren, 14 great-grandchildren and at least one great-great-grandchild. At age 110, Koide could still read newspaper without glasses and eat food without dentures and said his favourite food was bread and the secret to his long life was avoiding to overdo things, and not to smoke or drink alcohol.