The ends of our DNA, called telomeres, get shorter as we age. Our cells lose a bit of telomere every time they divide. This shortening is a normal and needed process that serves a protective function against cancer. This is because the older our cells get, the more likely they are to have accumulated damage or mutations that make them function incorrectly. Telomere shortening helps to take old cells that are reaching their “best before date” off the shelf before they can cause trouble.
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