Board Thread:Questions and Answers/@comment-3074300-20170126190128

In Chapter 71, Shadis says "I met Grisha... twenty years ago now?", meaning the year would be 830, but according to the pages on this wiki this happened 18 years ago and not 20. Meaning Zeke is 25 and not 27... was this correction made at some point in the manga or did someone think it was 18 years because of Ymir's Curse? 