The person listed as the oldest American vet was born in 1907 and fought in the South Pacific during WWII.  That makes him 107 years old.  One of his regular activities includes the intake of a bit of alcohol, which seems to be a common thread among people with long lives:

Overton also passes his time with up to 12 cigars a day and a little whiskey in his morning coffee. The hooch helps keep Overton spry, he said.“I may drink a little in the evening too with some soda water, but that’s it,” he said. “Whiskey’s a good medicine. It keeps your muscles tender.”

http://www.foxnews.com/us/2013/05/26/america-oldest-veteran-to-spend-quiet-memorial-day-at-texas-home/