Greenland sharks have long fascinated scientists due to their extraordinary lifespan. Recent research suggests that these deep-sea animals may live for several centuries, making them the longest-living vertebrates known to science. Some individuals are estimated to be over 400 years old.
How Scientists Estimate Their Age
Unlike most fish, Greenland sharks do not have hard bones that can be easily analyzed for age. Instead, researchers study tissue from the sharks’ eyes, specifically the lens, which forms before birth and remains unchanged throughout life. By analyzing radioactive carbon levels in this tissue, scientists can estimate when the shark was born.
Using this method, researchers discovered that many Greenland sharks alive today were born long before the industrial era, offering a rare biological window into the past.
Life in Extreme Conditions
These sharks inhabit cold, deep waters of the North Atlantic and Arctic oceans, where temperatures are near freezing and food is scarce. Scientists believe that this harsh environment contributes to their slow metabolism, which may be a key factor in their extreme longevity.
Slow growth, delayed maturity, and minimal energy use appear to protect the sharks from rapid cellular damage, allowing them to survive for centuries.
What Longevity Research Can Reveal
By studying Greenland sharks, scientists hope to better understand the biological mechanisms behind aging. While humans cannot directly apply these traits, insights into cellular stability, metabolic regulation, and DNA protection could influence future aging research.
The findings also raise concerns about conservation. Because Greenland sharks grow and reproduce very slowly, they are especially vulnerable to environmental changes and human activity.
