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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.
Dinosaurs lived in three periods of Earthâs history. The first was the Triassic Period (251 â 199 million years ago.) Not many well-known dinosaurs were from the Triassic Period. The second was the Jurassic Period (199 â 145 million years ago) when brachiosaurus and stegosaurus lived.