User blog comment:FairyRaven/Fairy Tail Chapter 438: The Seventh Guild Master, Review and Commentary/@comment-4933386-20150601123144/@comment-4933386-20150602004255

Last Ages rapidly ages that person that used it which makes her turning old. If Mavis used it, she might just "im 300 years older now" but still look the same in appearance.

Oh, I do think that Zeira is in Mavis' mind only, but I don't think it's just an illusion or a manifestation created by Mavis so she could feel less lonely. Why would an Zeira knows it's an illusion but Mavis doesn't know it herself?

I call that the Fairies came to her that time.. lol impossible. but shush.