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

(archaeology) A period in a civilization's development when the most advanced metalworking has developed the techniques of smelting copper from natural outcroppings and alloys it to cast bronze.

A demographic grouping based on age.

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

(law) The age at which a person is legally considered to be mature enough to engage willingly in sexual intercourse, so that it is not a crime for someone else to have sex with the person.

the period of life between youth and old age; midlife

(idiomatic) To reach a specific age where one is legally considered to be an adult. / (idiomatic) To mature, or become fully developed.

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

of, or relating to middle age; neither old nor young

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.