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I think i've had someone live to 76 or so. The first rulers usually live the longest on average, since they start out in their 20s or 30s (for the rulers most commonly picked), usually without any diseases or wounds to begin with (there is that one inbred, war invalid Italian count of course...). So they get the first couple of decades "free". Plus, if you start with a count, you won't be warring that much in the start.
 
William the Conquerer always lives pretty long I've noticed, unless he dies in battle earlier on.

That being said, the oldest ruler I've had is about 74 I think, but the oldest character I can remember in my dynasty was an 81 year old daughter.
 
William the Bastard often passes 70 when I play as his dynasty(Good genes!). The AI tends to get him killed off in battle relatively often though...

My longest living ruler would be the guy that starts as duke of Moray, he finally croaked at 75, leaving his lands to his blind grandson.
 
I can't remember my dynasty, but I had become king of italy and ruled a pretty nice domain. Unfortunately my awesome ruler died at 74, but the game froze on me and I had to revert to the yearly autosave. When I got my king back, he ended up living into his late 80's. Talk about a lucky break. :D
 
Uther Cerniw of Dumnonia has lived to 102. He kept having events saying 'being in a marriage state makes you' and I said 'feel so healthy' and he kept getting good stats... his son has died and the grandson looks set to inherit. He is 27 :p

I didn't mind though as he was a brilliant king.
 
In a Hungary game, I had the starting king (Salamon) live to 81. (starts at 14 or 15 y/o)

The guys in infertile with diplomacy 2...
Even worse is that his cousins, who were both cool (László and Géza) died before him, also Géza's son, Béla died, so the kingship went to László's idiot son...


The good thing was that by the time he died he had an insane amount of prestige and piety!