Pioneering techniques used in this research may soon be applied to other dinosaur fossils and alter the course of ...

By counting visible and hidden rings, researchers found that T. rex did not reach full size until 35 to 40 years of age.

It took the fearsome T rex 40 years to reach its full size, study finds - Findings extend growth phase of T rex by 15 years ...

A study of fossil bones shows Tyrannosaurus rex kept growing until around age 40, challenging long-held ideas about dinosaur ...

Tyrannosaurus rex lived longer and took more time to reach its maximum size than previously thought, according to a new study.

India, Jan. 16 -- For decades, scientists have estimated the age and growth rate of Tyrannosaurus rex by counting annual ...