Koi — Well known to inhabit decorative ponds, Koi are a domesticated and ornamental variety of the common carp. Certain varieties of koi are thought to live between 100-200 years. A famous red koi named “Hanako” reportedly lived to be 225 years old.
Tortoise — Tortoises are known for their longevity … but did you know the oldest tortoise lived to the ripe old age of 250 years old! Well, there is some controversy about that… But the story goes that Adwaita was captured in the Seychelles Islands in the 1700s, and was donated to the Alipore Zoo in India in 1875, and lived there — outliving his keepers — until 2006.
Greenland Shark — They’re also known as the Grey Shark or the Sleeper Shark … but they’re not as well known as the Great White although the Greenland rivals their size at over 20 feet long and weighing nearly 2500 pounds. One reason for the animal’s anonymity is their habitat. Native to North Atlantic waters, they prefer colder temperatures and tend to swim as deep as 2200 meters. And they’re thought to have long lifespans, possibly over 200 years. That number was arrived at when a shark was caught and tagged near Greenland in 1936. When it was recaptured in 1952, researchers found it had grown 6 cm longer. Following that formula, a mature 7-meter shark would be more than 200 years old.
Ocean Quahog (qwa-hog) — Much like the age of a tree can be deduced from its rings, these clams have dark concentric rings or banding on their shells that researchers interpret as annual marks. Judging from those rings, some specimens have been estimated at over 400 years old. In one notorious case from 2006, an ocean quahog clam nicknamed Ming was taken off the coast of Iceland. When its annual marks or growth rings were counted, the clam’s age was calculated at 405. When scientists opened the shell to study the animal’s insides, they effectively killed the clam. However, later analysis including carbon-14 dating proved the clam was actually 507 years old, making it the oldest individual animal whose age could be verified. It also earned Ming a Guinness Record for oldest mollusk. Ming, by the way, was named for the Chinese dynasty that was in power around the time it was born.