very old; having existed for a long time; ancient or well-established

(law) The age at which the rights and privileges of an adult are legally granted or recognized; i.e.; the age where a person ceases to be a minor legally and becomes a legal adult.

(archaeology, paleontology) A broad prehistoric period during which humans widely used stone for toolmaking. / (figuratively, informal) Any extremely primitive or undeveloped era.

A modern spiritual and religious movement. / (music) Ellipsis of New Age music..

Of or relating to a broad movement in Western culture, covering a wide variety of alternative spiritual and philosophical ideas, often spirituality, mysticism, holism, and environmentalism, and partially based on eastern religions such as Buddhism and Hinduism, that developed towards the end of the 20th century.

(often capitalized) Of or relating to the New Age movement. / Of or relating to New Age music.

(often capitalized) A modern spiritual and religious movement, covering a wide variety of alternative spiritual and philosophical ideas, that developed towards the end of the 20th century.

(history) A period of time ranging from part of the 17ᵗʰ century through much of the 18ᵗʰ century, characterized particularly by the importance of logic and reason.

A restriction placed on an activity based on the age of the participants; either lower or higher limit.

(idiomatic) A period of happiness, peace, prosperity, and/or great progress. / (mythology) The Golden Age.