17 years old as high school
He played a bisexual character in "Race You to the Bottom"
Justin Timberlake played a character named Frankie Ballenbacher in Alpha Dog.
Dakota Fanning played Tom Cruise's daughter in the movie "War of the Worlds." She starred alongside Cruise in the 2005 film directed by Steven Spielberg.
If by War of the Worlds you mean the 2005 film starring Tom Cruise, then the son's name is Robbie Ferrier, played by Justin Chatwin.
Justin Hartley
Justin Timberlake played a character named Frankie Ballenbacher in the movie production Alpha Dog.
He played his character, Justin, from wizards of waverly place.
Justin Taylor is a character played by Randy Harrison on the TV show "Queer As Folk". Justin's main plot line revolves around the trials and tribulations of being a gay teenager.
Robert Leembruggen has: Played Character Voices in "Jack the Ripper: An On-Going Mystery" in 2000. Played Jack Little in "Dr. Jekyll and Mr. Hyde" in 2002. Played Professor Leslie Stout in "The Hacking Chronicles" in 2007. Played Tom in "Past Perfect" in 2007. Played Justin in "Invisible Man" in 2008. Played Gerard Keogh in "Song of Roland" in 2012. Played Otis in "Personal Space" in 2014.
In CSI Justin Bieber played a character named Jason Mccann. Jason Mccann was the "bad guy" in the show. So he wasn't very nice. He also played Justin Drew Bieber in the movie Never Say Never, who is the sweetest boy alive :)
Danny Max has: Played Drew in "The Bold and the Beautiful" in 1987. Played Boy in "Jolene" in 2008. Played Justin in "Castle" in 2009. Played Proctor in "The Invisible Chronicles" in 2009. Played Larry Fasco in "The Prankster" in 2010. Played Ryan in "Arthur" in 2014.
Trenton Knight has: Played Ben in "Because Mommy Works" in 1994. Played Timmy in "Hardball" in 1994. Played Kyle Carson in "Models Inc." in 1994. Played Chris McClelland in "Munchie Strikes Back" in 1994. Played Zachary in "ER" in 1994. Played Sammy Curtis in "The Skateboard Kid II" in 1995. Played Billy in "The Tin Soldier" in 1995. Played Josh Griffin in "Invisible Mom" in 1996. Played Justin Franklin in "Forest Warrior" in 1996. Played Josh Griffin in "Invisible Mom II" in 1999.