TEHUCA | Workear and Hotel Linen Some of the oldest cotton bolls were discovered in a cave in Tehuacán Valley, Mexico, and were dated to approximately 5500 BCE, but more recent estimates have put the age of these bolls at approximate Some of the oldest cotton bolls were discovered in a cave in Tehuacán Valley, Mexico, and were dated to approximately 5500 BCE, but more recent estimates have put the age of these bolls at approximately 3600 …