Two days ago I found my chief had died of old age. The new chief was already 72 herself and the oldest in the tribe. I got her to create the magic food, lecture the kids, and point out a rare collectible although the old chief had done it only a few hours before. She died only a couple of hours later and my next chief was 14. So I got him to create yet more magic food and point out another collectible. I had to wait several hours for him to get old enough to teach the kids, though.