Board Thread:Manga/@comment-7278867-20170312084406/@comment-37493549-20181225024312

It was said Ymir died after 13 years, it's logical to assume it was the curse. Though of course we can't be sure.

We also don't know whether Ymir actually had one titan power in the first place which split when she died, or if she simply held all nine at once the whole time.