Castor and Pollux,identical Twins,get into Their Individual Spaceships and Blast

Multiple Choice

Castor and Pollux,identical twins,get into their individual spaceships and blast off simultaneously.Castor's is the faster ship,both return to Earth simultaneously.Which of the following statements is true?

A) Castor is older only if he traveled in the same direction as Pollux.
B) Castor is older only if he traveled in the opposite direction to Pollux.
C) Pollux is older only if he traveled in the same direction as Castor.
D) Pollux is older only if he traveled in the opposite direction to Castor.
E) Pollux is older.