The cellular clock theory holds that our cells divide:

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The cellular clock theory states that our cells can divide only a certain number of times, approximately 75-80 times, before they cease to divide and eventually die. This is due to the shortening of telomeres, which are the protective caps on the end of our chromosomes that shorten each time a cell divides. Once the telomeres become too short, cell division stops and the cell can no longer reproduce.

The Cellular Clock Theory Holds That Our Cells Divide