
Why does a deep-water shark in the Arctic routinely live past 400 years while spending almost all of that time functionally blind and moving barely faster than a walking human?
Radiocarbon dating of eye lenses shows Greenland sharks can live nearly 400 years, growing one centimetre annually in near-freezing Arctic water. A 2026 stranding in Ireland and new genetic work are revealing how their eyes, hearts, and DNA-repair systems resist age.















