Many anime and manga have become evergreen classics, but Akira Toriyama's original Dragon Ball series has entertained audiences for four decades and is still as strong as ever. Toriyama's Dragon Ball manga started in '84, and it establishes an excellent foundation that's gone on to influence some of the biggest anime of the next generation. It's easy for audiences to prioritize the sequel series Dragon Ball Z and Dragon Ball Super over their predecessor.
Source:https://www.cbr.com/why-fans-love-dragon-ball-after-40-years/