Do you know that the earth's core might be younger than its surface? The concept of time dilation is predicted by Albert Einstein's theory of General Relativity. This theory suggests that the passage of time is affected by gravity; in other words, time moves slower in stronger gravitational fields compared to weaker ones.
Since the Earth's core is at a location of stronger gravity than the surface (because it's closer to the mass of the Earth), time would theoretically pass slower there. Therefore, over the history of the Earth, fewer "seconds" would have passed at the core than at the surface. Thus, from a certain point of view, the core could be "younger" than the surface.
This effect is minimal on the scale of Earth's gravity and essentially unnoticeable in our daily lives. However, it becomes much more significant near much more massive objects, like black holes. This phenomenon was confirmed by the famous Hafele-Keating experiment, which showed that clocks flown around the world on jet planes (and hence experiencing less gravity than clocks on the surface) ran slightly faster than their counterparts on Earth.
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