“…However, if one grants the latter viewpoint (to the reference frame of the space-traveler), the homebody should be younger 20 There are many papers (e.g. Ben-Ya'acov 2016;Franson 2016;Fung, Clark, Lewis, Wu 2016;de Wolf 2016;Garcia-Escartin, Chamorro-Posada 2015;Gasperini 2014;Lindkvist, Sabín, Fuentes, Dragan, Svensson, Delsing, Johansson 2014;Moreau, Devaux, Lantz 2014;Sokołowski, Golda 2014;2014a;Grøn 2013;Carvalho 2012;Friebe 2012;Ord 2012;Sfarti 2012;Sokołowski 2012;Boblest, Müller, Wunner 2011;Grøn, Braeck 2011;Lichtenegger, Iorio 2011;Székely 2010;Grandou, Rubin 2009;Müller, King, Adis 2008;Roukema, Bajtlik 2008;Abramowicz, Bajtlik, Kluźniak 2007;Boccaletti, Catoni, Catoni 2007;2007a;Grøn 2006;Kohler 2006;McCall 2006;Madarász, Németi, Székely 2006;Ghosal, Nepal, Das 2005;Pesic 2003;Soni 2002;Uzan, Luminet, Lehoucq, Peter 2002;Barrow, Levin 2001;Dolby, Gull 2001;Weeks 2001;Cranor, Heider, Price 2000;Schön 1998;…”