Beef should be aged a few days before cutting. The amount of aging will depend on the amount of fat covering, desired flavor and temperature. Carcasses that have only a thin fat covering should be aged three to five days; those with more fat, five to seven days. Very little tenderization occurs after seven days.
Ask your average paleontologist who is familiar with the phylogeny of vertebrates and they will probably tell you that yes, birds (avians) are dinosaurs. Using proper terminology, birds are avian dinosaurs; other dinosaurs are non-avian dinosaurs, and (strange as it may sound) birds are technically considered reptiles.
Perhaps the confusion is more of the common perception of associating reptiles to snakes. However, snakes are the same as lizards because they both belong to the order Squamata. Reptiles are creatures of the Reptilia class and are placed in the Linnaean system in-between birds and amphibians in the Kingdom of Animals.