I can't get any of my villagers to the age of 75. One of my original villagers lived to 80, but since then the oldest has been 77.

All of my villagers are Esteemed Elders by the age of 30. I've completed all of the puzzles and have all of the awards other than Ancient Elders.

It really upsets me any time a villager dies. All of the 3rd generation of my tribe have been dying and I'm quite attached to them. I assumed they'd live to 90+ but all of them have been dying in their early 70s.

Is there something I'm doing wrong? I keep their health at 100%. There is plenty of food (over 100,000) and at least 75 Master doctors.