How Old Is Rexy the T Rex?

Rexy is a female Tyrannosaurus rex that appears in Jurassic World and Jurassic Park. She is one of the oldest dinosaurs on Isla Nublar, at 30 years old.
In the 1993 film, Rexy was 35-36 feet long and 14.5-15 feet tall. The films do not specify a name for her.
Rexy possesses incredible strength, even for a T. rex; her enormous strength allows her to take out two Velociraptors easily and smash large steel cargo crates. She can even briefly fend off the Indominus rex.

Rexy returns in Jurassic World: Fallen Kingdom and Jurassic World Dominion. Isla Nublar is abandoned by Dominion’s end, leaving Rexy to reclaim the island.
A new male T. rex called Rexinald appears in Dominion. At 34 years old, Rexy was at a disadvantage against the Giganotosaurus.

Theropods first appeared 231 million years ago. Birds evolved from small theropods.
T. rex existed for 1.2-3.6 million years, or 66,000-188,000 generations. The largest T. rex skeleton is 40 feet long and weighed up to 6.8 tons.