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So they are basically born the age of the original?
They way I understand it, with Dolly (a relative of yours, perhaps?), adult DNA was inserted into an egg, which eventually led to the birth of the first cloned sheep. This DNA, as it was from an adult sheep, had already undergone some of the DNA damaging processes that happen all the time (for example, there are bits of DNA on the ends of chromosomes which are just a repeated short pattern - these are called telomeres, and often become shortened over time due to imperfect copying). Because some DNA damage had already occurred, Dolly passed away of age related illness before she would have done if her DNA was pristine at birth.