User blog comment:BlackWizardZeref/Double Review: FT Chapter 416 & FT Zero Chapter 7/@comment-197.224.47.254-20150120163703/@comment-24039250-20150130231154

Zeref appears to be in his late teens yet is 400+ years old, and Mavis appers to be about 13 yet is 100+ years old. Also with Mavis being in the crystal, its hard to say whether or not she's dead.