In Vampire: The Masquerade, Antediluvians are the 3rd Generation clan founders. They are at least 10,000 to 15,000 years old, having lived before the Great Flood and surviving into modern nights. Their progenitor, Caine, is the oldest, estimated to be over 200,000 years old. [1, 2, 3, 4, 5]

Detailed Vampire Generation Breakdown

• Caine (1st Generation): Caine is generally accepted to be over 200,000 years old, having wandered alone for ‘eons’.
• The 2nd Generation: Embraced directly by Caine, these three figures (Enoch, Zillah, and Irad) are about 12,000 years old.
• The 3rd Generation (Antediluvians): The founders of the 13 clans are typically 10,000 years old or more, embraced around 8,000 BCE in the Fertile Crescent before the great flood. [1, 2, 3, 4]

(Note: If you are referring to the biblical or historical “antediluvian period” rather than the World of Darkness setting, it refers to the 1,656-year span of time between Creation and the Genesis Flood.) [1, 2]

Are you asking from a lore-building perspective for a Vampire: The Masquerade (World of Darkness) campaign, or are you interested in the biblical/historical meaning of the term? Let me know and I can provide more specific details!