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Due to gravitational time dilation in relativity, Earth's center is 2.49 years younger than the surface.
https://arxiv.org/abs/1604.05507
Note: This is not strictly a new result. Feynmann made a remark about it in '62-63, but he said "...a day or two younger..."; this paper just corrects the result, which was generally accepted via "proof by authority".
@canadalek You have 500 characters instead of 140... ;)
@redacted Oh, it's worse than that, but it's a looong story.