Recently on the Discovery Channel, they were talking about travel at the speed of light, and how you don't age - this is false, they have no evidence or proof to make that claim. That idea comes from Einsteins General theory of relativity, which is wrong. Time is a constant, if you travel at the speed of light for 10 years - you will age 10 years.
Good math. I built Satellites for F.M.C. in the 80's. It's complicated but true.
Time dilation is true - the effect gravity has on devices that measure time, gravity has no effect on time. - Also travelling at the speed of light has no effect on time or aging.