BY any conceivable measure, Frank Buckles has led an extraordinary life. Born on a farm in Missouri in February 1901, he saw his first automobile in his hometown in 1905, and his first airplane at the Illinois State Fair in 1907. At 15 he moved on his own to Oklahoma and went to work in a bank; in the 1940s, he spent more than three years as a Japanese prisoner of war. When he returned to the United States, he married, had a daughter and bought a farm near Charles Town, W. Va., where he lives to this day. He drove a tractor until he was 104.

But even more significant than the remarkable details of Mr. Buckles’s life is what he represents: Of the two million soldiers the United States sent to France in World War I, he is the only one left.

This Veterans Day marked the 89th anniversary of the armistice that ended that war. The holiday, first proclaimed as Armistice Day by President Woodrow Wilson in 1919 and renamed in 1954 to honor veterans of all wars, has become, in the minds of many Americans, little more than a point between Halloween and Thanksgiving when banks are closed and mail isn’t delivered. But there’s a good chance that this Veterans Day will prove to be the last with a living American World War I veteran. (Mr. Buckles is one of only three left; the other two were still in basic training in the United States when the war ended.) Ten died in the last year. The youngest of them was 105.

At the end of his documentary “The War,” Ken Burns notes that 1,000 World War II veterans are dying every day. Their passing is being observed at all levels of American society; no doubt you have heard a lot about them in recent days. Fortunately, World War II veterans will be with us for some years yet. There is still time to honor them. But the passing of the last few veterans of the First World War is all but complete, and has gone largely unnoticed here.