Today this system has changed to single age.Man of all ages have to run and toil to earn money.

Why u stopped with three

Childhood; Young and middle age

The three age system constitutes of three time periods from the human prehistoric period. They are the Stone Age,the Bronze Age and the Iron Age.The Three age System describes the progress of societies during that period.The stone age is divide into the age Palaeolithic ,Mesolithic and Neolithic. The tools used in the Palaeolithic age are Handmade tools and objects found in nature cudgel, club, sharpened stone, chopper, handaxe, scraper, spear, harpoon, needle and scratch.In the Mesolithic age are Handmade tools and objects found in nature bow and arrow, fish basket, boats and in the Neolithic are Handmade tools and objects found in nature chisel, hoe, plough, yoke, reaping-hook, grain pourer, barley, loom, earthenware (pottery) and weapon. During the Bronze Age the tools used were Copper and bronze tools, potter's wheel.Finally during the Iron age Iron tools were used.

He three-age system is the periodization of human prehistory into three consecutive time periods, named for their respective predominant tool-making technologies:

* The Stone Age
* The Bronze Age
* The Iron Age
The system is most apt in describing the progression of European and Mediterranean societies, although it has been used to describe other histories as well. The system has been criticised for being too technologically determinist.