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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 walked the Earth for an incredible 165 million years. They first appeared in the late Triassic Period, before diversifying to dominate the planet, and become the largest land animals to have ever lived. However, 65 million years ago, the reign of the dinosaurs was to come to an abrupt end. An event so monumental occurred that it changed the shape of our planet forever. Evidence points to a giant asteroid which smashed into the Earth, leaving a crater nearly 200km wide.