I've actually lost track of time myself, to be honest. I'm trying to piece it together.

Sabine was fourteen years old when we started. She turned fifteen before Rhazii was born. We then timeskipped to Sabine's eighteenth birthday before heading to Elsweyr, so Rhazii would have been three years old. Newt is either one or two years younger than Rhazii? The timeskips are fuzzy for me after that. I would have to look them up.