Multiple choice The Old Stone Age started about.... 2.5 million years ago 100,000 years ago 10,000 years ago 1 million years ago Reveal answer Fill a bubble to check yourself A Correct answer Explanation The Old Stone Age, or Paleolithic period, began about 2.5 million years ago when early hominids first started making and using simple stone tools. This incredibly long period lasted until the development of agriculture around 12,000 years ago.