60’s: The Ghost and Mrs. Muir, The Addams Family, Get Smart, The Monkees, I Dream of Jeanie
70’s: M*A*S*H, Barney Miller, Soap, Mary Hartman Mary Hartman, Mork and Mindy, The Carol Burnett Show, Maude, Carter Country
80’s: Designing Women, Cheers, The Wonder Years, The Golden Girls, Newhart, Night Court, Kate and Ally
90’s: The Nanny, Ellen, Grace Under Fire, Murphy Brown, Blossom, Frasier, Seinfeld, Friends, Roseanne, Mad About You, News Radio, Just Shoot Me, The Class
2000–2010: Monk, The New Adventures of Old Christine, Will and Grace, Scrubs, My Name is Earl, Freaks and Geeks
For me, for it to qualify as “old” it has to be off the air.