Just to clarify, Zappa was able to deduce the formula for how likely a character is to die once they reach the 'dieable' age.

Quote Originally Posted by Zappa
CDpY = (max_age_before_death - max_age) / (max_age - old_age) * 100%

With the latest numbers that would be:

181-180 / 180 - 40 = 1 / 140 = 0.7% chance of death per year

The default numbers are:

105-90 / 90 - 60 = 15 / 30 = ~50% chance of death per year... In other words, the vast majority will not make it past 62 years old, which is exactly what we have been seeing in the vanilla settings.
There's also some talk that the time scale a mod uses might make a difference. DLV, for which this research was conducted, progresses at 2 turns per year. LTC uses 1.5 turns per year. We could test this ourselves, but it's something I would ask Zappa about if possible.

The thing to remember is that while some, maybe most characters will live longer, some will die sooner than 61. We could use DLV's default range of 50-110, Zappa's preference of 18-100 (Not as bad as it sounds, each character only has a 1.22% of dieing per year) or whatever range we want. I wouldn't want to decide that by committee though, and would prefer DLV's default. Death at fifty would mean 68 turns of playtime if he comes of age at 61, which is pretty good.

Also, fun fact: A character who comes of age at 16 and lives to 110 lives for 188 turns. That's longer than the entirety of WotS, KotR and LotR!