How Old Is Shalltear Bloodfallen in Jojo Bizarre Adventure

Let's cut right to the chase and clear the air on a fantastic, albeit fictional, crossover: Shalltear Bloodfallen, the formidable Floor Guardian and True Vampire, is a cornerstone character from the dark fantasy series Overlord. She does not, in fact, appear in JoJo's Bizarre Adventure. Therefore, the direct answer to "how old is Shalltear Bloodfallen in JoJo's Bizarre Adventure" is simply: she isn't! The question itself is a fun, imaginative leap that bridges two distinct and beloved anime universes....