How Old Is Ainz Ooal Gown in Blue Exorcist

Is Ainz Ooal Gown, the formidable skeletal Overlord, secretly a character in Blue Exorcist? And if so, how old might he be? We understand the curiosity, as both series feature powerful, often dark, protagonists in fantastical settings, making imagined crossovers incredibly tempting. Let's set the record straight: Ainz Ooal Gown is not, and has never been, a part of the Blue Exorcist universe. He hails exclusively from the critically acclaimed dark fantasy series Overlord, where he reigns as the undisputed Supreme Being of the Great Tomb of Nazarick....