Spanish Civil War[]
There is only one american veteran left, so on the US side of things (as an american I'm american-centric) this doesn't give us much more time to spend with him gathering stories. With nine non american vets and the one american vet still around this should give us maybe 3 to 5 more years to spend with them gathering their stories and life experiences.
World War Two[]
If things stay the same we should expect to see the last world war two veteran die in 2038 around the age of 110ish. That gives us twenty more years to spend with them, gathering their stories and life experiences.
Korea[]
If things stay the same we should expect to see the last veteran of the korean war die around 2045 around the age of 110ish. This give us around twenty-seven years to spend with them, gathering their stories and life experiences.
Vietnam[]
If things stay the same we should expect to see the last Vietnam Veteran die around 2067 at the age of 110ish. This gives us around forty-nine more years to spend with them documenting their life experiences and stories.