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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 DID EXIST. There can be no doubt when you see the skeletal remains of huge animals, some 76 feet long and 40 feet tall, that dinosaurs once lived on this earth. In fact, in light of what the word dinosaur means, I think we can say that some of them still exist today.