Possible Clues:

• Approach taken by wise person in olden days
• Time before computers, facetiously
• Fred and Wilma's time
• When the Lascaux caves were painted
• Era for Fred, Wilma and Pebbles
• Very old cardinal put on clothes
• One of the Wise Guys getting to grips with way of speaking, for a time?
• Paleolithic period
• Period Toynbee regularly covers? On the contrary, this is prehistoric
• Primeval