'Space age' definitions:

Definition of 'space age'

(from WordNet)
noun
The age beginning with the first space travel; from 1957 to the present

Definition of 'Space age'

From: GCIDE
  • Space age \Space age\, n. the time during which humans engaged in space exploration; -- generally considered as beginning on October 4, 1957 when the Soviet Union placed the first artificial satellite into orbit around the earth. [PJC] space bar