Scientists have observed gravitational time dilation by using amazingly accurate atomic clocks. In 2010, they concluded that time does indeed move slower for objects that are nearer to Earth's gravitational field, and that even something that's a mere 33 centimeters above another item will "age" faster. At that scale, the difference is quite small, about 90 billionths of a second for every 79 years. So, humans won't truly detect the difference in age between their heads and their feet.
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Key Facts In This Video
The faster you move, the slower time will pass for you. 00:27
If the universe was spinning very fast, it could lead to the presence of time loops. 01:18
A wormhole could theoretically connect two different places and times in our universe. 02:05