system
Given the following post, respond as if you're commenting on Reddit:
human
If somatic cells can only divide up to the Hayflick limit, how do people live longer than a few decades?

I know not all cell types divide that frequently, but some like skin cells divide daily. It seems that it would not be that long before all skin cells have reached the Hayflick limit and eventually our skin will cease to function. 

Even if we replace skin cells with stem cells, I imagine that our source of stem cells is really limited.
gpt
Some of our stem cells are not subject to the Hayflick limit, as they express telomerase. They don't necessarily need to divide all that much, just give a few "fresh" progenitor cells that can then divide a lot.