Board Thread:The Last Sovereign Discussion/@comment-27713488-20181103233945/@comment-31763506-20190725162221

Maybe Tanurak also changed the composition of draconic bones so they don't decompose.

Since "A Wizard Did It!" is totally an acceptable answer.

I think I can propose another upper limit for Ulrissa's age though. She's described by Xerces as a "Givini" sage, so she was probably born after the 1st Arclent War or Foundation War which led to the emergence of Givini as a state. Obviously the Givini ethnicity could be much older, but 500 years seems like a good upper limit.