'Stone age' is a very broad term. Usually it's described in two periods, the Paleolithic during which tools were made by chipping stones to form edges and point

'Stone age' is a very broad term. Usually it's described in two periods, the Paleolithic during which tools were made by chipping stones to form edges and points, with dates back to the first stone tools (2.6 million years ago, or possibly 3.3 mya based on newish evidence); and the Neolithic, when tools were made by grinding and polishing and also when plants were domesticated (~11,700 years ago, afaik). There's also mesolithic, inserted between those two, though I haven't heard it used much.