Top 7 longest living animals

Ocean Quahog

You know how the age of a tree can be deduced by its rings? In the same way, researchers have interpreted that the Ocean Quahog has dark concentric rings or bands on its shell as annual marks from which its age can be determined. Some of these specimens have been collected and its age is supposedly over 400 years. These animals show phenomenal longevity with the highest reported age of this particular species being around 507 years old! That is more than half a century of years!