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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 first appeared in the Triassic period about 230 million  years ago. Non-avian dinosaurs roamed the earth until about 65  million years ago and then were wiped out,â¦ most like by the impact  of an asteroid or comet. Birds, which are now classified with the  dinosaurs, continue to live to this day. Dinosaurs lived on earth for over 160 million years. They were the dominant terrestrial vertebrates from the late Triassic period (around 230 million years ago) to the end of the Cretaceous period (around 65 million years ago).