Two students, Allison and Nora, are both the equal age when Allison hops aboard a flying saucer and blasts off to achieve a cruising speed of 0.830c for 25.5 years round trip (according to Allison). Ignoring the brief time periods required for the acceleration of the ship during blastoff and turnarounds, compute the difference in age between Nora and Allison when they are reunited.
Find who is younger?