I once heard something about how if two twins existed and on boarded a space ship and traveled at the speed of light for a 4 year round trip, the twin on the space ship would have aged 4 years while the twin on earth would have aged over 30 years.
Now if this is true, this leads me to believe that time is relative/subjective and not absolute/objective, so is time applicable in any way to anything above and beyond my personal experience?