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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.
Most of the facts about the Velociraptor are now well known. This is due to the discovery of several fossils. It lived during the Cretaceous period and became extinct 70 to 80 million years ago. Like the other dinosaurs it likely perished when a comet / asteroid struck the Earth at the time.