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With this evidence we can see that T-Rex was fully grown by the age of 28 and lived at least this long; however, we cannot determine if this is a good age for a fully grown T-Rex. As for the larger dinosaurs like Sauropods, estimates state that these giant beasts could have lived for as long as 100 years or more. In part, this incredible lifespan was due to the lack of predators that preyed upon it and an herbivorous diet which reduced the potential for conflict or injury while feeding.
The dinosaur would have measured 24 feet (8 meters) long and weighed about 2.5 metric tons (2.75 short tons). Its home was Laramidia, an island continent created by a vast interior seaway that split North America in two between about 95 million and 70 million years ago.