Some Greenland Sharks Alive Today May Have Been Contemporaries of Shakespeare

Greenland sharks are among the slowest-moving predators in the ocean, and now, perhaps, among the longest-lived vertebrates on Earth. New radiocarbon-based age estimates published in 2026 suggest that some of the largest individuals currently alive may have been born around the late 1500s — giving them a lifespan that would overlap with the lifetime of William Shakespeare.

The age estimates come from eye-lens radiocarbon dating, a technique first developed for Greenland sharks in the 2010s and refined over the past decade using updated bomb-pulse baselines. Because the proteins in a shark's eye lens are laid down early in life and never turn over, they preserve the carbon signature of the year the animal was born. Calibrated against atmospheric radiocarbon curves — including the distinctive spike from mid-century nuclear testing — the technique yields age estimates that, for the largest specimens, extend well beyond four centuries.

The extraordinary longevity is not an accident. Greenland sharks live in waters near freezing, where every joule of metabolic energy is precious. They grow at roughly a centimeter per year, do not reach sexual maturity until somewhere between 150 and 250 years of age, and can outlive multiple human civilizations. The trade-off is that each individual represents an enormous investment of oceanic resources — and each loss to fishing pressure carries a disproportionate cost to the population.

The biological implications extend beyond a catchy headline. If some Greenland sharks really do span five centuries, the species serves as an unintentional archive of changes in Arctic chemistry, ocean temperature, and contaminant accumulation over time. A single individual's tissues could, in principle, record centuries of change in a way no other vertebrate can. For science, that turns the shark from a curiosity into a living historical record.

For policy, the story is a stark reminder of how conservation frameworks built for short-lived species fail organisms on this timescale. A fishery closure that seems prudent on a 20-year horizon may be trivial relative to the animal's true lifespan, and a single bycatch event may erase the work of a century and a half of growth. Governing sharks, it turns out, requires thinking on a Shakespearean timescale.