In Moana, the sacred place has 15 stones of past chiefs, if given the average life expectancy was around 65, then that would be ~1000 years they've been on the island, which is how long ago that Maui stole the Heart of Te Fiti and when the ancient chiefs first forbid voyaging.

Schnutzel on September 17th, 2017 at 12:41 UTC »

This would require a new chief every 65 years. By the time the old chief reaches 65, his/her child would have already been an adult.

huu11 on September 17th, 2017 at 14:54 UTC »

But their boats would have rotted in a 1000 years....

GeForce88 on September 17th, 2017 at 15:37 UTC »

Yeah, that's not how the age gap works though.

Each new chief-to-be would need to be an adult first, so I'm guessing around 15-20 years old before they can be chief. Let's say a chief has their first kid when they're 20 years old, that makes them only 35-40 years old when their kid is minimum age to take over.

Assuming each chief has a 65 year reign, starting at age 15 means that at the end of their reign they would be 80 years old and their kid would be 60 years old, and their grandkid would be around 40 years old, and so on.