The series makes many references to classic rock music, its title being taken from T.Rex's song "20th Century Boy", as well as a number of manga and anime from the 1960s-1970s.
He also portrayed the character Kakuta on the film 20th Century Boys.
20th Century Fox | 20th United States Congress | The Beach Boys | Beastie Boys | Backstreet Boys | Pet Shop Boys | American Association (19th century) | American Association (20th century) | The Bowery Boys | BSC Young Boys | 20th | Boys & Girls Clubs of America | The Boys | Jersey Boys | Boys' Life | The Dead Boys | Lost Boys of Sudan | Boys' Brigade | The Lost Boys | the Beach Boys | Sport Boys | Newell's Old Boys | Geto Boys | Essex Boys | Century Park | Century of Progress | Century Media Records | Century 21 | Bevin Boys | Baltimore Orioles (19th century) |
Until the 19th and 20th century, boys attended the Cheder (literally "room," since it was in the synagogue, which historically was a building with a Bet Midrash being the only room) or Talmud Torah where they were taught by a Melamed tinokos' (children's teacher).