This is one of the typical fairy tale Bible babble. There is not biological possibility that any mammal could live that long. Even whales who have very long life span or turtles do not live 900 year. Even fossils indicate that large dinosaurs lived between 60 to 80 years the most.
Egyptian and Babylonian myths are full of long lived people, but there is no any excavated evidence that anyone lived beyond 100 years. While old age over 90 was not very common in ancient times, it was not as surprising. Ramses II lived probably to the age 90+. Several ancient monarchs lived closed that age as well. In late antiquity many monks lived long age like Cassiodorus who died 100 years old, and Saint Nilo 95 years. These are documented ages as these people were very active and left extensive trails of documents over their long life span.