the time of the Industrial Revolution

The age in which nuclear energy and nuclear weapons were developed.

The era, starting in the mid-1940s, during which nuclear energy was developed, and in which it was thought that all energy would be provided by such sources.

The chronological age of individuals of the same maturity as the person in question.

The period from the about the time of the launch of Sputnik in 1957 to the present day, during which people ventured into space. / (attributive) Redolent of the space age; appearing futuristic or modern.

Alternative letter-case form of space age

(idiomatic) A time period of years or more.

Alternative letter-case form of Atomic Age

(statistics) The number of people in stated age ranges.

(horse racing) Handicapped according to the age of the racehorse competing (and certain other factors).