<P> This is a list of the last World War I veterans to die by country . The last living veteran of World War I (28 July 1914--11 November 1918) was Florence Green, a British citizen who served in the Allied armed forces, and who died 4 February 2012, aged 110 . The last combat veteran was Claude Choules who served in the British Royal Navy (and later the Royal Australian Navy) and died 5 May 2011, aged 110 . The last veteran who served in the trenches was Harry Patch (British Army) who died on 25 July 2009, aged 111 . The last Central Powers veteran, Franz Künstler of Austria - Hungary, died on 27 May 2008 at the age of 107 . </P> <P> The total number of participating personnel is estimated by the Encyclopædia Britannica at 65,038,810 . There were approximately 9,750,103 military deaths during the conflict . </P>

When did the last world war 1 vet die