I am not a bio major but I have heard about Telomerese shortening in each cell division which leads aging and cellular death. I also read that Hayflick limit is about the number of divisions a cell can make before it dies.
So my question is, how is it possible for us to have constantly dividing cells such as in our hair or nails. They are also cells right? They constantly divide almost our entire life, so how come they do not die out of Hayflick limit?
Or is it like, when a cell divides for the first time, it loses one unit of Telomere but the second cell also have the same number of Telomeres as the first one? I mean if Hayflick limit is 50 for the first cell, is there like 49 and 49 for both cells after division? And when do they decide to divide, is the first cell waits its child to reach Hayflick limit before it divides again? Is this just too complicated to explain in layman terms or are we just not sure yet?
Please do not go hard on me if I have conceptual mistakes, I am just really curious about this.