As far as the scientifically plausible means of time travel go, we would physically, due to means of aging at a slower rate as compared to the people on Earth if we are to go near the speed of light. As far as we know, there's really no way to "turn back the clock" or change how fast this clock turns. But we can speed up or (hypothetically speaking) slow it down in comparison to the individuals on Earth via speed and location in spacetime.