After 6 months, astronauts in the International Space Station would have aged about 0.007 seconds less that people on Earth. This is due to the International Space Station moving much faster than the Earth. Time itself will bend due to differences in gravity or velocity. Now what if an object starts to move close to the speed of light? Time would seem to slow down for the object when observed from immobile point of view. A person traveling at 75% of the speed of light in a space ship will age only 40 years compared to 60 years on earth.