I. noun
Date: 1854
1. : the first known period of prehistoric human culture characterized by the use of stone tools — compare Mesolithic , neolithic , Paleolithic
2. : a stage in a human institution or field of endeavor regarded as primitive, outmoded, or obsolete
the Stone Age of information handling before computers
II. adjective
Date: 1865
1. : of, relating to, or resembling the culture of the Stone Age especially in the use of stone implements
modern Stone Age peoples
our Stone Age ancestors
2. : primitive, outmoded, or unsophisticated (as in ideas or technology) by currently accepted standards
marauding mercenaries with Stone Age political ideas — Robert Moss
using a Stone Age camera