According to the Scan text for T-Rexaur, it has been “alive since the beginning of time.”
THE BEGINNING OF TIME.
A brief incomplete summary of creatures in the Final Fantasy series that have canonically existed since the beginning of time
- The Cloud of Darkness, a personification of the void that the universe sprang from
- Necron, the embodiment of despair
- Altana and Promathia, the gods of creation and chaos who conjured the universe
- T-Rexaur, a big dinosaur who lives at a school
(Thank you Amanda Lepre for spotting this.)