It's a clam. They estimate it was born around the time of Queen Elizabeth I.
Scientists said the mollusc, an ocean quahog clam, was aged between 405 and 410 years and could offer insights into the secrets of longevity.
Researchers from Bangor University in Wales said they calculated the clam's age by counting rings on its shell.
Now that's cool. H/t to Metafilter.