It is definitely based on average. When I first had to study this statistic in class, the average age was 23. The more data we get, the more of the big picture we can see (which causes a shift in the average simply because there are more data points to average out). It’s like “one size fits most” – it fits a lot, but you’ll still have a considerable amount of people on either side of the average, who are older or younger than 25.
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