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.
