What children here refer to the pilots of EVANGELION. There are 5 pilots listed i.e. Ayanami Rei, Souryu Asuka Langely, Ikari Shinji, Suzuhara Touji and Nagisa Kaoru. Not every single person could be an EVA pilot, those children were chosen due certain conditions by an orginazation named Marduk. They should have a high syncronic ratio, unless they won't be able to control the EVA. In fact, all of the children were 14 years old (man, i'm far too old Y_Y) that they were supposed to be born after the Second Impact.

i think most of EVA otaku must've dreamed to sit in the entry plug, well at least i did 6_6, but when i ask inumako about it, she replied firmly, "BIG FAT NO" without telling me the reason. however, i think it's because she have a terrible motion sickness that she probably will puke in less than 1 minute inside the EVA ^o^. poor inuko...