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U.S Researchers Analyzed The Largest T. Rex Dataset, 17 Leg Bones, To Study Growth Rings, Revealing Hidden Annual Patterns. The Findings Show T. Rex Reached Full Adult Size (~8 Tons) Around Age 35–40, Not 20–25 As Previously Thought. They Matured Gradually Over Decades With Prolonged Adolescence, Implying Lifespans Well Beyond 40 Years.

T. rex fossil discovery rewrites dinosaur history and reveals how long they really lived | Daily Mail Online

https://www.dailymail.co.uk/sciencetech/article-15471407/T-rex-fossil-discovery-dinosaur-history.html

Scientists believe they now know the true lifespan of the Tyrannosaurus rex, rewriting what was known about the ancient predators.