T. rex Rewrites Its Growth Timeline: Adulthood Arrives at 35–40
TL;DR
A peer‑reviewed study analyzing growth rings in 17 T. rex leg bones shows full adult size was reached around ages 35–40, with rapid growth from 14 to 29 and extended growth for at least a decade afterward, implying a longer subadult phase and prompting renewed questions about species boundaries within fossils labeled T. rex.
- Paleontologists Found a Clue Hidden in T. rex Bones for 66 Million Years and It Rewrites Everything They Thought They Knew Indian Defence Review
- T. rex didn’t become an 8-ton giant overnight: Scientists reveal how long the apex predator took to grow Fox News
- T. rex took 40 years to become fully grown New Scientist
- Tyrannosaurus rex took 40 years to reach full size Popular Science
- It took 35 years for T. rex to become fully grown CNN
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