http://www.mangago.zone/read-manga/hana_wa_saku_ka/mh/v02/c025/8/
There they look exactly like Tetsuo and Pureblood (Junsei?) from Sweet Pool (⌒▽⌒)
Hey, I found something that could explain his difference in age
http://www.mangago.zone/read-manga/yakusoku_no_neverland/nbt/m_chapter-74/pg-7/
See? They fed him some medicine. But maybe it's for something else :)
I don't doubt that this is a real normal Norman: we saw in the chapter Adam, with Norman in one building, but Adam lives in Goldy Pond with other children. Then it is logical to assume that he escaped, but he couldn't do it alone, so Norman gathered a dream team and they all escaped. I don't think Norman would abandon Adam, they accidentally did split up, that all explains why Adam reapeted over and over again Norman's number - number of his saviour and the person he lost
http://www.mangago.zone/read-manga/yakusoku_no_neverland/nbt/m_chapter-75/pg-3/
There is Adam with Norman in one building









FINALLY