Original: John Henry Foster '' Jack '' Babcock ( July 23 , 1900 â '' February 18 , 2010 ) was , at age 109 , the last known surviving veteran of the Canadian military to have served in the First World War , and after the death of Harry Patch was the conflict 's oldest surviving veteran .
Simplified: John Henry Foster '' Jack '' Babcock ( born 23 July 1900 - 18 February 2010 ) was the last living Canadian veteran who fought in the First World War .