Some stuff I learned today:
Time is absolute but personal. Time changes by the gravitational pull.
Time travel, in theory, is possible. If a rocket leaves the earth and its gravitational pull, going in an incredible speed, travels in space where time is going much slower, it will come back to the earth that has been subjected to time going faster. So for those astronauts who aged 10 years, they come back to earth where time has passed faster, say 1 thousand years.
My question is, although time measured out in space lapsed only 10 years, would your body age in relation to the personal time or would it age in its own isolated time, aging similarly to the people on earth?