A Dr. John Preston, PsyD, Psychology, answered. The average age of onset for bipolar disorder is 23, although late-adolescent onset is fairly common. Bipolar disorder can occur as early as 6 years old or as late as 50. Dr. John Preston, PsyD, Psychology, answered. The average age of onset for bipolar disorder is 23, although late-adolescent onset is fairly common. Bipolar disorder can occur as early as 6 years old or as late as 50.
John Richard Schneider III. John Richard Schneider III (born April 8, 1960) is an American actor and singer. He is best known for his portrayal of Bo Duke in the 1980s American television series The Dukes of Hazzard, and as Jonathan Kent on Smallville, a 2001 television adaptation of Superman.
Cast and charactersEdit. Cast of The Dukes of Hazzard (from left): (bottom) John Schneider, Tom Wopat, Catherine Bach, Denver Pyle, Peggy Rea; (top) Ben Jones, Sorrell Booke, James Best, Sonny Shroyer.