Board Thread:Manga/@comment-39121488-20190413131938

So, I'm on volume 23 and I'm wondering if there is a mistake or maybe this is explained later in manga (if it is, please don't spoiler anything just tell me). So I'm thinking about Uri's age, he is like maybe in early 30 when he gained his titan power from his father but when he passed his ability to Frieda he was like I don't know maybe 50 or older? (is there any info about his age?) I think this doesn't match with course of Ymir which tells that every one who gained titan ability will die in 13 years, even Armin told to Eren that Reiss family passed their ability every 13 years but is this correct? Next example can be Keith Shadis who told to Eren that Grisha came 15 years before wall Maria collapsed, so he had his titan power at least 2 years longer, maybe Keith just doesn't remember exactly when Grisha arrived? 