Recent scientist report have identified a large Caribbean sponge that is considered to be older than the Roman Empire around 2300 years. Read more about the world's oldest living sponge. World's Oldest Living Sponge: Recent Marine Scientific reports have identified the world’s largest Giant Barrel Sponge (Xestospongia muta), considered the world’s oldest living sponge or animal. It is estimated that a deep-sea marvel is around 2300 y... [2731 chars]