Four boys: Alfredo, Bucky, Declan, and Franklin. They're on an island (with lots of beautiful girls!). Alfredo likes looking at beautiful bikini-clad girls. He settles on the beach. Bucky hops in a spaceship. Declan hops in another spaceship. Franklin hops in a machine attached to the earth. Bucky goes .9c through space in S-like (talking about the letter) motion for ten days. Declan goes .9c through space in a straight line, loops (doesn't stop) at the 5-day mark, and heads back to earth in straight line. Franklin is spun around in this machine at .9c for the same amount of time. They all start their journeys at the same exact moment and go .9c for "ten days." And they all return to the starting point at the exact same moment. Who is oldest? Who is the youngest?