"Prehistoric times" refers to a period in the past before written records were kept. It is a time when humans did not have written languages or permanent settlements. Full definition
While honey was probably one of the earliest sweets — consumed since prehistoric times — sugar cane is believed to be first cultivated. (preparedfoods.com)
The reason for this prediction is that during prehistoric times mothers had no choice except to breastfeed their babies. (brianpalmerdds.com)
It must go back to prehistoric times when people stood there and looked up at the sky and wondered what's going on up there. (discovermagazine.com)