Pauly Shore was born in 1968. Fry was born in 1974 according to the Infosphere.
Fry would likely have had knowledge if Pauly Shore was frozen before him.
My guess is a toss up between the 80s guy and Pauly Shore.
Edit- Since 80s guy died from Boneitis, Pauly Shore is the oldest. (Not counting the heads in the jars).
If you do count the heads, is anyone older than George Washington?
Hail Atlanta!