Possible Clues:

• Old time?
• It began with the Paleolithic period
• Very old individual taken into theatre
• Early epoch when man used pre-metal tools
• Possibly stage one in the development of civilisation
• Sounds like a bolder, older time
• When the Flintstones lived
• Theater ÷ 1 = Neolithic
• "The Flintstones" setting
• The theatrical profession includes one from long ago