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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.
Brachiosaurus lived on earth during the late Jurassic period and even in the early Cretaceous period almost 156 to 145 million years ago. It was 75 feet long, 41 feet tall and weighed around 89 tons. It was so long that, it could reach for the foliage at the top of the trees.