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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.
Ruling our planet as the dominant terrestrial vertebrates for 135 million years, dinosaurs were the largest creatures that ever inhabited Earth. The biggest sauropod dinosaurs may have achieved lengths of 190 feet and heights of over 30 feet, which is, in modern terms, an incredible size. Not all dinosaurs were that large; there were creatures just about 20 inches long but even these little beasts usually looked scary.