Q When was the growth spurt for Tyrannosaurus?

The cross-sections of dinosaur bones contain lines similar to the rings found in trees, which are called “growth rings.”
By counting these rings, we can determine the dinosaur’s age, and the spacing between the rings reveals how much it grew in a single year.
Based on the growth rings in Tyrannosaurus bones, it was discovered that they experienced a massive growth spurt between the ages of 12 and 16.