Babylon's Adad might be the best leader to try this with. (she has a 50% lower chance of dying and starts older than Ramesses II)
It took me 20 games (of doing nothing) to reach 100 years old. (she can die whether you settle the first city or not)
She starts getting ill around 60 year old.
Brute force custom game:
- mortality - lengthy
- turn scale - years
- no BTT and WOG DLC (fewer events)
- map size - huge
- 1 opponent
- tribes only - passive strength
- no barbs
Runs:
- dead turn 40+
- dead turn 30+
- dead turn 77 (turn 36)
- dead age 70 (turn 29)
- dead age 86 (turn 45)
- dead age 92 (turn 51)
- dead age 70
- dead age 67
- dead age 70
- dead age 64
- dead age 97
- dead age 66
- dead age 73
- dead age 65
- dead age 67
- dead age 72
- dead age 89
- dead age 74
- dead age 73
- centenarian at turn 59 (died at 118, turn 77)