Jonathan is a giant tortoise living on Saint Helena. A tortoise is a turtle that lives on land. He is believed to be 194 years old. He is the oldest known living land animal. (sainthelena.gov.sh)
How has he stayed alive for so long? A recent study gives one possible answer. Scientists studied his DNA, the body’s instruction book. They found helpful changes in genes connected to aging. Some help repair damage and protect cells from cancer. Others help control energy inside cells. (lifescience.net)
Cells have tiny parts that work like batteries. These parts give energy to the body. In Jonathan, important gene switches stayed unusually orderly. A gene switch turns a body instruction on or off.
For example, his switches looked like those in younger tortoises. This may help his cells make energy and repair damage well. (igenbio.com)
However, scientists do not know every answer yet. Jonathan’s body shows an important idea. Healthy aging is not only about time. It is also about keeping important cell systems working well.










