Sumerian gods are roughly 4,500 to 5,000 years old. The oldest written records of their stories and names date back to around 2900–2600 BCE in ancient Mesopotamia, making them among the earliest documented deities in human history. 

The civilization itself began between 4500 and 4000 BCE, and major primary deities—like the sky god An, the storm god Enlil, and the water god Enki—were firmly established in worship by 3000 BCE. While the written texts are over four millennia old, the stories themselves were often passed down through oral tradition for generations before ever being carved into clay tablets.