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?
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The answer you are looking for is general relativity, which can be summarized as: the closer you are to massive objects with heavy gravity (planets, stars, black holes) the slower time will pass for you compared to someone farther away. Time is not a universal constant. Instead, every person, every object has a different time. Because we, as people, live in mostly the same conditions as every other person, all on the same planet orbiting the same sun, our times are so similar that there is no point in making any distinction between my time and your time. Even astronauts in space have a difference of less than a nanosecond. However, in science fiction stories, we can imagine scenarios where people live in places that are distinct enough to have times that are different enough to compare, introducing time dilation.
You mentioned time dilation in the movie Interstellar. When the crew visits a water planet, that planet is orbiting close to a black hole, and left one person on the main ship far away from the black hole. The crew near the black hole, because of how massive the black hole is, experience time passing much slower for them than the person on the ship far away from the black hole, or the people back on Earth who are also not near a black hole.
You can imagine this as a game which is lagging on your PC. Normally the game proceeds at the same speed as you sitting in your chair, with one second passing for you and one second passing in the game, but imagine the game starts to lag. Then everything in the game will slow down as your computer cannot simulate what normally happens in one second, and it will instead take three or four seconds from your perspective. While four seconds passed for you, only one second passed in the game. This is an approximation of what watching someone go near a black hole would be like. You are the observer, hanging out far away from the black hole, while your game took a detour near the black hole and experienced time dilation. If your game was growing crops, even if the game says your crops grow every ten seconds, for you it would look like forty seconds because of lag.
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