;)<p>We could just use statistics.<p>Example: the DNA has 3.2*10^9 base pairs.  We have trillions of cells. Even if each cell division introduced 1000 mutations, the cells would hit the Hayflick Limit at around 60 divisions. The last generation of a cell line would have 60000 mutations on average and the other cells less so.<p>It&#x27;s nothing compared to the size of the DNA. I can&#x27;t go through with the calculation right now but my guess is that it wouldn&#x27;t take more than a billion cells to get to your birth DNA.<p>That part of my argument was just an easy way to deal with the writer&#x27;s assumptions.