Board Thread:General Discussion/@comment-24726378-20150102200745/@comment-31121580-20180424194609

Ichibei is the oldest zanpaktu as he name everything in SS and even achieved The First bankai without a actual Shallow sword.

Nimiya is the 2nd, he is the creator of the Shallow sword and every shinigami in SS has one including Yamamoto so this dude is obious older