There are no American veterans of World War I alive today. The last veteran of the World War I, Frank Buckles, died in February, 2011 at the age of 110.
As of 2013, there were around 1.7 million American veterans of World War II still alive. There are around two million surviving veterans of the Korean War still living and more than seven million Vietnam War veterans living today.
The last surviving World War I veteran in the United Kingdom, Florence Green, passed away on February 4, 2012 at the age of 110. The veteran who lived the longest after the end of World War I was Russian Mikhail Krichevsky who died at the age of 111 in 2008.