I had old Flavius Julius reach 88 before the short campaign ended. Would have been interesting to see how long he went.

A couple of my faction leaders have reached their 80s. Khnumhoptep (Egyptian) took down the Seleucids and Parthia before he passed at 85 I think. I've had two FLs in my current Scipii game hit 80: Gaius (at the beginning of the game), and Julianus the Philosopher/Killer (about 100 years later on).