Belonging in the Stone Age.

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

Alternative letter-case form of Stone Age

The Neolithic period.

A period of African prehistory between the Early Stone Age and the Late Stone Age, generally considered to have begun around 280,000 years ago and ended around 50–25,000 years ago.

The Paleolithic period.

(idiomatic) Out of touch with the modern world. / (idiomatic) Politically incorrect. / Used other than figuratively or idiomatically: see stuck, Stone Age.