Synonym of modern period or modern history (the period following postclassical history, in Europe known as the "Middle Ages", spanning from about 1500 to the present).

Alternative letter-case form of Jet Age

A test that uses aggravated conditions (e.g. heat, humidity etc.) to speed up the normal ageing process of an item to see the long-term effects on it within a shorter period of time.

Alternative letter-case form of silver age

(historical) A period that lasted from the mid-16th (or mid-15th) to the mid-19th centuries, in which the dominance of sailing ships in global trade and warfare culminated.

(rail transport) The time when trains were powered by steam locomotives. / A period of industrialisation when steam power was used.

Mental reversion to a younger age, used in therapy, as a coping mechanism, or as a manifestation of a psychiatric issue.

(historical) A period in the 1920s and 1930s in which jazz music and dance styles rapidly gained nationwide popularity in the United States.

Alternative letter-case form of digital age

(archaeology, paleontology, geology, geochronology) The age of a material as determined by radiometric dating.