When characters reveal knowledge they have, the reader should say "Oh, guess he's been through something that would have given him that knowledge." Instead, you're telling me Alix's past is limited to what you remember about it, and therefore he must have never known anyone who experienced female puberty and is therefore talking out his ass.
Alix is an only child, but he lived with his parents for his entire childhood. His mother is one adult woman he's been around; he doesn't know what her puberty was like, but she would have at least been someone in his life who had periods. (Alix is not only worried about the onset of puberty, but also about how supposedly moody he thinks women get at their time of the month, and that is also applied to adults.)
Alix went to public school, which he's mentioned, and which I think we can agree would have exposed him to girls going through puberty. And he worked a few jobs over the years (including a job at the circus, which as I've mentioned before, was not "running away to join the circus"; it's just a job he took, as an adult).
He didn't grow up in a bubble isolated from normal human interaction. He's had friends and relationships (yes, including the female friend you mentioned--Cherie, who's mentioned in the previous issue). Odd, given all this, that you suggest he must have learned about things that affect girls and women from television.
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