Your text doesn't really match the question title... longest-surviving ancestor, or most recent ancestor?
For me, the most recent that would be my great-grandfather on the Neff side, who died in 1948 (at age 82) .... but now I'm going to have to search my photos and make sure I really don't have a picture of him.
The longest-surviving ancestor in the photographic era (of whom I don't have a picture) would be John Gynne Bean, who lived 1791-1883, and died at age 92.