I didn't know I could do that! I'll load up my save and check it out (and edit this post later)...
Yeah, I really enjoy seeing the timeline of people aging as well, I had a great 48-year first playthrough so many people lived, were born, and died in that time frame and my oldest grandkids were almost 18 by the time I unified Calradia as my eldest child/daughter (who was 43 where I left off in 1132).
It was a surprise, a sad one at that, but not too unexpected because I figured I'd probably die in my 50's and made sure my new kingdom could handle not being led by me while I spent a season "in the hospital" and hurrying up my daughter (who was leading a clan party) back to my own unit so I could smoothly transition authority (and player-control) to her. Unfortunately, I overestimated how many troops she could lead by a factor of 100 or so but it wasn't a big loss since I could dump out low tier units in Senala to make room for them, but it was a big shift from ~500 to ~350 or so (including the kingdom policies that boosted how many troops I could lead by 80 cumulatively). I even had some nice RTK6 and 7 music to add more ambiance to my own funeral and subsequent election...
It did interrupt my campaigning around Ortyisa, but, thankfully, the Vlandians didn't take the opportunity to attack me during this moment of weakness and their King Erdurand (son of Derthert, he took over during the very first year of my playthrough) actually died of natural causes just 2 seasons after I died. Epic coincidence.
I thought the medical perk to avert serious illness would apply if granted by a medic (my doctor ended up living into her 80's!) but it didn't, so I got the notification that I was slipping in and out of consciousness shortly after I turned 49.
EDIT: According to the Encyclopedia, the oldest person ever at the time of their death was a woman named Zerosica "of Phadon's Clan" at the age of 92, dying of natural causes in 1124. The oldest person alive is a man named Joron Leonipardes at the age of 87. Then it's living lady Agnala of the Qarais' Clan at 86, dead lord Arcor of the Osticos at age 85 in 1118, living mercenary captain Valaos of the Embers of the Flame at 84, and so on. Emperor Lucon's the oldest living monarch who died at the age of 81 n 1103; Yarli Bloodaxe is my oldest living companion, 81 as of now (and ironically spent most of his life as a governor lol); the oldest CURRENT monarch is Urik Kuloving, aged 72, King of Sturgia while the youngest (not counting independent clans or mecenaries) is Queen Loen dey Meroc of Vlandia, aged 38.