5. Ocean Quahog (Arctica islandica)
The ocean quahog (Arctica islandica) is a modest clam with a truly astonishing lifespan. Some individuals, like the famous “Ming,” have been found to live over 500 years.
Researchers believe their exceptional longevity is linked to slow cellular metabolism and highly efficient DNA repair, which help minimize damage and slow aging. Compared to other long-lived mollusks, ocean quahogs stand out for their resilience and near-agelessness. As BBC News notes, these clams are living time capsules from centuries past.