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... I thought that was something we all went through?

Ah, but combining my two answers - chronological and DNA, she should basically be human. Genetically, she's human.
I don't say that out of any notion that all species age like yours, but because,...

Byrne established her age in the first couple of issues. 18, I think?
He mentioned how long ago her egg was found. Also, she may be alien, but she's based on human DNA.

- Le Messor
"Modern...