What about in School Reunion where the Doctor says "I don't age, I regenerate"?
Sorry, forget it. Let's just pretend that line didn't exist and go with BM's explanation.
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Mitosis in multicellular organisms is a lossy format of cellular reproduction, so there are telomeres on the ends of the chromosomes which shorten each time.
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I know that arguing with you is a silly thing to do, but, I thought it was meiosis?