> "Arthur is the longest-running kids animated series in history [...]" said the show's executive producer

Let's not forget the German Sandmännchen (children's bedtime stop motion animation) running since 1959 ...

https://en.wikipedia.org/wiki/Sandm%C3%A4nnchen

And in Japan there's a few more in addition to the ones parent comment mentioned:

Detective Conan January 8, 1996 Chibi Maruko-chan January 8, 1995

https://en.wikipedia.org/wiki/List_of_anime_series_by_episod...