Long running manga

So I was thinking of collecting several of the Jojo's Bizarre Adventure manga but then I saw that the series has 118 volumes and it hasn't ended yet. This reminded me that there are other long running manga that are still going like Naruto, Fairy tail, Berserk, Dragon Ball (getting its Super arc soon as a comic), and One piece. It's so crazy that people follow these and other series at the same time. I mean I follow Dragon Ball and Berserk, but they don't have as many as the others mentioned.