Telomeres are responsible for protecting the ends of chromosomes in the cell chromosomes.
Vary depending on the type of animal, the amount of human telomeres is about 50 times.
That this is exhausted is that the end of their lives.

The right figure shows the state in which shorter telomeres.

The telomeric DNA at the ends of the chromosomes of the cell, there is an array of hundreds of repetitions of a sequence of TTAGGG.

The enzyme Teromeraza stretches the array, and for the sake of telomere maintenance.
Telomerase in humans is not seen very often.
However, seen in the germ cells and stem cells, such as ovaries and testes.

In addition, cancer cells are present in large numbers.
Therefore, cancer cells will proliferate indefinitely, they will attack the normal cells around for their own growth.

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