The Tyrannosaurus rex only had a lifespan of around 28 years.
Arguably the most well-known dinosaur, the Tyrannosaurus rex lived during the Late Cretaceous period in North America, about 85 million to 65 million years ago. The largest T. rex ever found only lived to around 29 years old, which scientists determined through lines in its fossilized bones. The creature would have achieved adult size after 20 years.
