Quote Originally Posted by Kranel_San View Post
I'd like to add that if I'm not mistaken. There's a line that mentions he was severely sick from birth and didn't have much time to live. As such, I believe physically he died during his teen years and is the reason why he look very young and childlike. He's probably the same age of Alphinaud/Alisaie prior to his death.
This takes me back to a comment I made in another (since derailed) thread in response to someone saying that Calyx likely has a tragic backstory that hasn't been fully explored yet.

I thought it noteworthy that the Endless from Living Memory based their visual appearance on the happiest moment of their lives; it seems to me that, judging by his appearance and the facts you've mentioned, Calyx doesn't have a 'happiest moment in his life' to base his appearance on.