It isn't easy to tell from dinosaurs' fossilised remains how long they lived. Dinosaurs are a diverse group of reptiles of the clade Dinosauria.They first appeared during the Triassic period, between 243 and 233.23 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research. Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years. Dinosaurs' long reign on Earth may have had more to do with lady luck than with superiority, according to a study published today in Science.The study challenges the old notion that dinosaurs … Scientists do not know the exact lifespan of the dinosaurs, but they estimate that dinosaurs lived about 75 to maybe as much as 300 years. How do you find dinosaur fossils? How old are you? Sign Up. "Traditional" estimates based on slow, reptilian growth rates, combined with the enormous size of dinosaurs, led scientists to conclude it … Learn about the mass extinction event 66 million years ago and the evidence for what ended the age of the dinosaurs. That’s how long ago the very first dinosaur was alive. Carnivores may have lived to 30 years, herbivores far longer. Yes, an asteroid really did wipe out the dinosaurs, study finds. Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years. That was a long, long time ago. If all of Earth time from the very beginning of the dinosaurs to today were compressed into 365 days (one calendar year), the dinosaurs appeared January 1 and became extinct the third week of September. Sauropod (brontosaur) dinosaurs appear to have had lifespans similar to those of an elephant or human--roughly 70 years. When dinosaurs were born, the Earth was a very different place. Updated 3:00 PM ET, Mon June 29, 2020 ... thereby creating a world largely unsuitable for dinosaurs to live … If all of Earth time from the very beginning of the dinosaurs to today were compressed into 365 days (one calendar year), the dinosaurs appeared January 1 and became extinct the third week of September. How long did dinosaurs live? Think of that number, and take it and stretch it out all the way to the Moon… about a thousand times. Did you know that the first dinosaur was born about 230 million years ago? Tyrannosaurus matured at about the same rate we do. marcusskyfall, Feb 26, 2018: Hi, I'm struggling to work out how such large creatures sustained themselves? On average, T. rex may have lived only about 30 years or so, because it lived dangerously, not only by grappling with well-armed prey, but others of its own kind. By Katie Hunt, CNN. Subscribe to our newsletter. Why did the dinosaurs go extinct? Are dinosaurs still alive today? 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