DAY 34

Comment

One can imagine a situation on a remote island where the average age of the population stays more or less stable, even though the individuals making up the population change, with old people dying and new people being born. But is that what is happening here ... ?

Answer

The average age has probably increased.

Readers' methods

Hidetoshi N, Chiba:
If everyone stays on the island, the average age might not change.
If young people leave, the average goes up.

xxx