Astronauts age more slowly than people on Earth, but the difference isn't noticeable: after six months on the ISS, they age about 0.005 seconds less than those on Earth.
Einstein's theory of relativity suggests that time is relative and can be affected by gravity; this causes astronauts on the ISS to experience time at a different rate compared to individuals on Earth.
Gravitational time dilation explains why time appears to move slower near massive objects, meaning astronauts, further away from Earth's center of gravity, age slower than those on the ground.
The effect of aging slower in space is minuscule: after an extended stay, astronauts may be just 0.0075 seconds younger—imperceptible to human experience.
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