Age and Era

An age is a period of existence, a generation to which one belongs, or a long but indefinite space of time. In this context, it is any great period of human history distinguished by certain mythical or real characters: the Bronze Age, the Golden Age, the Middle Ages, etc. An era is an historical period marked by particular influences or social conditions, or a new stage in the history of an individual, institution, or nation: Christian Era, Depression Era. Ages and eras are also spoken of in the context of geology.