(a) Is it possible for you to travel far enough and fast enough so that when you return from a trip, you are younger than your stay-at-home sister, who was born 5.0 y after you?

(b) Suppose you fly on a rocket with a speed v = 0.99c for 1 y, according to the ship's clocks and calendars. How much time elapses on Earth during your 1-y trip?

(c) If you were 22 y old when you left home and your sister was 17, what are your ages when you return?