Assertion: tortoise's size | /r/HasProperty | depend on average age of the population
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text: Note - "average" size is not really relevant here as giant tortoises will grow continually through their lives as long as they are well nourished, so the average size of a population depends on the average age of the population, which is currently not as old as it was in the past before giant tortoise numbers fell due to killing for food and habitat degradation.