Birthday Calculation

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“It’s $2019$. Two days ago, I was $15$. Next year, I’ll be $18$,” said Ginger.

For this claim to be true:

(a) when is Ginger's birthday?

(b) on what date did he say this?

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The date when he said this is January 1. On December 30th he was 15 years old. On December 31st last year (one day ago), he turned 16 . On December 31st this year, he will turn 17. On December 31 next year, he will turn 18.