Hehe, That's actually a very good question. I have her at 16 now but I'm rereading the book to see where she is at the exact canon point that I grabbed her from because through the course of the three books she goes from 15 to 20.

I'm like 89% sure that she's 16. Either way, she's very close to Azula's age and they've probably seen each other in school. Clary is an art student. If you want them to have Pine's memories of each other, something Vague like sharing some classes and Clary always sketching when the teacher is talking. It's your call. I love Alzua and I'm excited for them to bounce off each other.