Home People Christopher Knight Christopher Knight shows Christopher Knight shows Christopher Knight TV Shows (33) Celebrity Ghost Stories (2009) He was 51 years old Celebrity Family Feud (2008) As Himself, He was 50 years old Dirt (2007) He was 49 years old Rachael Ray (2006) He was 48 years old The Greg Behrendt Show (2006) He was 48 years old My Fair Brady (2005) He was 47 years old E!'s 101 (2003) He was 45 years old The Surreal Life (2003) He was 45 years old Less than Perfect (2002) He was 44 years old That '70s Show (1998) He was 40 years old The View (1997) He was 39 years old E! True Hollywood Story (1996) He was 38 years old New York Undercover (1994) He was 36 years old The Bradys (1990) As Peter Brady, He was 32 years old Day by Day (1988) He was 30 years old Masquerade (1983) He was 26 years old The Brady Brides (1981) He was 23 years old Joe's World (1979) As Steve Wabash, He was 22 years old CHiPs (1977) He was 19 years old Shake, Rattle and Roll (1977) He was 19 years old The Brady Bunch Hour (1976) As Peter Brady, He was 19 years old The Bionic Woman (1976) He was 18 years old One Day at a Time (1975) He was 18 years old Happy Days (1974) He was 16 years old ABC Afterschool Special (1972) He was 14 years old The Brady Kids (1972) As Peter Brady (voice), He was 14 years old The ABC Saturday Superstar Movie (1972) As Peter Brady, He was 14 years old The Brady Bunch (1969) He was 11 years old The Brady Bunch (1969) As Peter Brady, He was 11 years old The Brady Bunch (1969) As Arthur Owens, He was 11 years old Mannix (1967) He was 9 years old Another World (1964) As Leigh Hobson, He was 6 years old Gunsmoke (1955) He was 2 years old
