What is t-Rex's lifespan?

Why are dragons so often a knight's opponent in a fairy tale story Where exactly did these stories of knight vs. dragon come from? What is a fire dragon in adventure quest worlds? What is bigger a tyrannosaurus or a blue whale? How were T-rex born? Do dragons exists today? What are the types of dinosaurs in the Dino Silly Bandz pack? What is the theme of believer for imagine dragons? What is T-rex in night at the museames code? What was the smallest meat eating dinosaur? What element is bones and teeth? How big are a t-rex egg? How do you get a hold of Dr Ernest Drake? How are dinosaurs and birds are alike? What time of period did Marie Maynard Daly live in? What are the names of the daleks in the cult of skaro? How much does a dinosaur head weigh? What does a gallimimus dinosaurs habitat look like? Do dinosaurs eat people? Where can you buy dinosaur skeletons? What is a Heterodontosaurus?