Abacus

You can initially choose a reference frame where the rocket is stationary and the earth is moving away. Here, a clock on earth would be ticking more slowly than a clock aboard the rocket, since the earth is moving and the rocket is not. However, if the astronaut on the rocket ever wishes to return to the earth, he will have to start moving in our chosen reference frame. In fact, he'd have to move even faster than the earth if he is going to "catch up" to it. At this point, rocket time will be going slower than earth time. Once he makes his rendezvous with the earth, the astronaut will find that he has aged less than his colleagues at home.

Tenpudo

Not to mention, he has to accelerate to escape the earth in the first place...