In 1994, the Greatest Generation voted D+7, higher than any other generational cohort.
https://www.pewresearch.org/politics/2015/04/30/a-different-...
Your link doesn't seem to cover the Greatest Generation.
Also, the Democrat party has steadily moved leftwards over time.
I don't have statistics, but combat veterans voice very negative opinions on Jane Fonda and her support for N Vietnam.
Democrats in 1994 were a very different proposition when compared to today. They had the union vote locked up, and the greatest generation benefited greatly from unions.