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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.
Allosaurus likely attained its full adult size by age 15 and lived up to 28 years old, a 2006 study in the Journal of Morphology found. Allosaurus had a short neck and a narrow, elongated skull, which was disproportionately large, similar to those of other big carnivorous theropods.