Well, if they are surviving, they haven't died yet!
And there are three verified veterans that are 109 years old
that were living as of 3/25/2010.
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A list of deceased Vietnam War veterans in the US can be found
on the Vietnam Veteran's memorial. You can also find this type of
list by contacting the VA in your area.
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The last living British World War I veteran, Florence Green,
died on February 4th, 2012 at the age of 110. She was a member of
the Women's Royal Air Force and the last living person to serve in
WWI.
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The vast numbers of war veterans makes it pretty difficult to
make such as site. There are specific unit sites and databases that
can be referenced, but there is no single consolidated list at this
time.