What is "stone-age"

Usage examples of "stone-age".

Ignacio Saenz de la Barra had sent as the first fruit of the agreement, six heads with the corresponding death certificates, the head of the blind stone-age founding father Don Nepomuceno Estrada, age ninety-four, last veteran of the great war and founder of the Radical Party, dead according to the accompanying certificate on May 14 as the consequence of a senile collapse, the head of Dr.

Yes, they live in a real stone-age technology, but they all are still smart as a whip.