The term for the part of the protective areas or tip of the DNA that grow shorter every time the cell divides is known as a telomere
Toward the ends of each and every chromosome in our body lies a long chain of repetitive monotonous DNA called a telomere, which goes about as a protective cap. A telomere is a region of monotonous repetitive DNA groupings toward the ends of a chromosome. Telomeres shield or protect the ends of the chromosomes from getting frayed or tangled. When a cell separates or divides, the telomeres become marginally more limited. In the end, they appear so short that the cell can never again divide effectively, and the cell dies.
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