Hello holog,

sorry, I made a mistake: Don´t travel to alpha centauri but rather to
a star which itself recedes from earth at *almost* the speed of light.
Let your speed be twice the speed of light *with respect to the earth*
for your way to the star and twice the speed of light *with respect to
this star* when you travel back to earth. Then you will come back
before you started.

regards,
Jürgen