THE AMAZING ADVENTURES OF KAVALIER & CLAY (MICHAEL CHABON) AND THE EINSTEIN TWIN PARADOX

His face seemed to have aged less than Sammy´s or than, God knew, her own, and his expression, as he puzzled out the unfamiliar sights and smells of the cozy kitchen of their Penobscott, had something  of the old bemused Joe that she remembered. Rosa had read about the Einsteinian traveler at the speed of light who returned after a trip that had taken a few years of his life to find everyone he knew and loved bent or moldering in the ground. It seemed to her as if Joe had returned like that, from somewhere distant and beautiful and unimaginably bleak

Sergiomumo

It is well explained. The twin paradox is a famous thought experiment (Gedankenexperiment) proposed by Albert Einstein and has been depicted in films like Interstellar. I have always cosidered the concept of 'Thought experiment' to be an oxymoron, but the question is as follows: a twin stays on Earth and the other travels at near light speed into space; the perception of time is different for both brothers. The one who has been on Earth is older than the traveler. It's actually an old problem, perception of time and synchronization of clocks.