Ciaran 18 years old Throughout the comic, the artist misspells her name as "キラアン" instead of "キアラン"

※Overall, I'm overly paranoid※

※I'm overly paranoid about Ciaran's real face※ Unsure about this

...I'm overly paranoid about their relative age (when converted to human life)

The four knights, except Gough, are nobles, so they were all born and raised in Anor Londo. A family that can be used by the Lord from the get go. And Ciaran is the youngest, so I hope she grows up to be a good girl!