During what time period did T'rex live?

The Tyrannosaurus rex lived during the the Maastrichtian age of the upper Cretaceous period and estimated 65 to 70 million years ago. It lived throughout what is now western North America. Geological records only exist for a time span of about 5 million years. T. rex ended its existence at the time of the Cretaceous–Paleogene extinction event 65-66 million years ago.