OK so I know this has been asked but I still don’t get it.
Who do humans age faster/slower? (Shown in interstellar for example) Biologically I don’t understand why the body would age faster?
In: 36
Everyone’s body ages exactly the same way at exactly the same speed.
What’s different is that time isn’t actually a universal thing that we all agree on. It passes for each person completely independently of everyone else.
Space and time are basically the same thing. Think of *c* as the *conversion factor* between space and time. Everyone that’s sitting still together is moving forward through time together at the same speed. But if you accelerate so that you are moving fast relative to everyone else, from their perspective you have traded some “speed” in time for your speed in space. From your perspective, after you have accelerated, you perceive yourself to be still in space again, and are still moving forward in time at the speed you will always move. But from their perspective you are now moving slower in time because you are moving faster in space.
It’s also important to point out that there are two kinds of time dilation: special relativity (caused by the difference in speeds, where both observers see each other’s clocks ticking more slowly only as a result of the difference in perspectives), and general relativity (caused by spacetime curvature and accelerations, where the effects aren’t symmetric), but it’s much harder to ELI5 these.
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