If normal human cells can only divide 50 times, shouldn't people die if they divide 50 times?

1. Inn ... You are talking about the experiment of culturing cells in vitro, which was done by Jelf Li. You ignored cell differentiation, selective gene expression and various factors. He said not 50 times, but 50 generations. After 50 generations of cell division, all cells aged and lost their function. The average cell division cycle of human beings is 2.4 years. Don't forget to add various external factors. According to him, under normal circumstances, people's life span is 120 years old, what's more, what he put forward is just a statement, just like cell theory and Darwin's theory of evolution, which is untenable. 2 and 3 say together: fertilized eggs grow into adults through cell division and differentiation, and differentiation must be essential and the result of selective gene expression.