Question

why our age doesn't grew in space?​

Answer 1

Because astronauts like the ones on the International Space Station (ISS) are moving so quickly, they're also aging a bit more slowly than the rest of us. Due to a principle of physics known as time dilation, after a six-month stint on the ISS, returning astronauts are just a tiny bit younger than the rest of us. But before you book a ticket that'll take you literally out of this world, understand this isn't exactly a fountain of youth we're talking about. Your six-month effort at age reduction will only garner you about 0.007 seconds of extra life, according to the calculations of one ISS astronaut.