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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.
Many dinosaurs were quite small: Xixianykus, for example, was only about 50 cm (20 in) long. Although the word dinosaur literally means terrible lizard, the name is something of an etymological misnomer; even though dinosaurs are reptiles, they are not lizards, nor are they descended from them.