Hi.. Speedo, flying in space, is at large speed compared to c relative to his brother on earth. Therefore, after a long time meeting at rest relative to each other, Speedo aged less than did his brother from his brother perspective. But from Speedo's point of view, his brother was also moving at that same large speed, and therefore he aged more slowly. So does everybody see the other younger (provided they're twins)? So what's wrong with me?