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.
Nevertheless, according to Dr. N. Robin Liley of the University of British Columbia, the sex of a fish or of a reptile is known to be more susceptible to change than that of a mammal or bird. As examples, the sex of a maturing reptile may be determined by environmental temperature, while a school of trout can be made entirely male simply by adding a certain hormone to the water.