Just like groups of mammals, different
dinosaurs lived and grew at different rates. All of our knowledge that we have
about how fast dinosaurs grew, and how long that they lived, is really group dependent, depending on
group of dinosaurs it is. Some of our best evidence comes from Tyrannosaurus, and
Tyrannosaurus that we know that they reached adult size in seventeen years or around
seventeen years. In the oldest member of Tyrannosaurus Rex that we know, the Sue specimen in Chicago which is just a little bit over twenty five years
old. Obviously our sample is very small so
it's highly likely that Tyrannosaurus lived longer than that, we just don't have the
samples to show it.