Stage 4 refers to a phase in Demographic Transition Model where both birth rates and death rates are low, leading to a stable but older population.
Think about it like your favorite TV show. In its first season (Stage 1), it's new and exciting with lots happening - high drama (high birth/death rates). By Season 4, things have settled down; there's less drama but still enough interest to keep viewers watching - steady ratings (low/stable birth & death rates).
Demographic Transition Model: A model that describes population change over time.
Fertility Rate: The average number of children born to women during their reproductive years.
Life Expectancy: The average period that a person may expect to live.
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