Harry Landis, the oldest US WWI veteran has died in Florida at age 108. OK, I said that already in the title of this post. But in December, J. Russell Coffey - the last oldest WWI veteran - died in Ohio at age 109. This leaves one known WWI survivor of the 4.7 million who served. Frank Buckles of West Virginia who is 107 was only 16 when he enlisted - he lied about his age.