The stone age start when all of the ice from the ice age melted and turned into to stone. People brought stone to britain on a bout and it was a group of people on the bout aswell. It took 1000 years to build stone henge. It also, took a group of people to build stone henge aswell. After the stone age it turned to the bronze age. Then it turned to the iron age. Then it turned into earth  we are standing in right this moment.