Golgo 13 centers the titular legendary hitman and is the oldest manga still in publication. The series was launched back in 1968 and last April 3rd, Shogakukan published the manga's 196th volume, as well as a special "Pandemic" collection book, which compiled the three past chapters of the manga focusing on bioterrorism last May 1st. The manga's return date will be announced at a later date.
[Source: Anime News Network]