These TV shows have stood the test of time and continue to run as the decades pass. The 58-year-old TV series 'General Hospital' is listed by Guinness World Records as the longest-running U.S. soap opera; 'Days of Our Lives' is only two years younger. The popular children’s TV show 'Sesame Street' was first broadcast 52 years ago. 'SNL' has been rotating cast members and guest hosts since 1975. 'The Simpsons,' which has won 32 Emmys over the past three decades, is the longest-running animated show. 'South Park' and 'SpongeBob SquarePants' have also been on the air for many years.