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Because that's part of Gatsby's characterization, which is also only introduced in the third chapter.
We can arrive at this answer because:
Gatsby is only introduced in the third chapter of the story, and Fitzgerald does this to heighten the suspense and mystery about this character. Therefore, introducing the term "old sport" in the middle of the third paragraph is part of Gatsby's characterization and allows the reader to learn more about him.
More information about Gatsby:
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