antediluvian

Belonging or pertaining to, or existing in, the time prior to the great flood described in Genesis, or (by extension) to a great or destructive flood or deluge described in other mythologies.

(humorous, figurative) Of attitudes, ideas, etc.: extremely old-fashioned, especially to a laughable extent; antiquated.

(humorous, figurative) Of a person or thing: very old; ancient.

Of animals and plants: long extinct; prehistoric.

A person who lived in the time prior to the great flood described in Genesis, especially one of the biblical patriarchs.

(humorous, figurative) A person with extremely old-fashioned attitudes, ideas, etc., especially to a laughable extent; a fogey or old fogey.

(humorous, figurative) A very old person.