Ocean Quahog
The Ocean Quahog (Arctica islandica) is the longest lived unitary animal found yet. Clams and other hard-shelled bivalves have seasonal growth rings in their shells that can be used to estimate their ages. Animals over 100 years old are common and one individual nicknamed Ming (dredged up off Iceland) was estimated to be 507 years old.
You can find more information on quahogs in the Successful Aging library.
Yoda
Yoda was a legendary Jedi Master and stronger than most in his connection with the Force. Small in size but wise and powerful, he trained Jedi for over 800 years, playing integral roles in the Clone Wars, the instruction of Luke Skywalker, and unlocking the path to immortality.