What a 400-Year-Old Shark Can Teach Us About Human Longevity

A study of Greenland shark heart tissue found heavy fibrosis and large amounts of lipofuscin, both classic signs of aging.

Despite this damage, the sharks were still active and functioning.

Researchers say extreme longevity may depend on preserving function while tolerating accumulated wear, not eliminating it entirely.

The findings could reshape research on human aging, disease resistance, and healthy lifespan.