The final living veteran of World War I died peacefully in her sleep this weekend at the impressive age of 110. Florence Green enlisted in Britain's Royal Air Force in 1918 at the tender age of 17 and served during the final two months of the war. She would have turned 111 on February 19th. She outlived the last two surviving male veterans of WWI—Claude Choules, a Royal Navy sailor and the last WWI combatant, and Frank Buckles, the last American veteran, both of whom died last year at the age of 110. With Miss Green's passing, the end of an era is truly upon us.