Do ALL the cells in the body regenerate every few years? Or, maybe it was every molecule that changes?

Question

I have heard that we (humans) become literally different people every four or so years. Every cell that existed four years ago is now gone and has been replaced by a new cell.

Is this true?

Answer 1

Most cells in our bodies live only 90 days, so every 90 days, we have almost all new cells. Some cells, like nervous system cells do not reproduce, which is why when the spinal cord is damaged, you are paralyzed for life. It doesn't regenerate. Which leads to a discussion on stem cell therapy. If scientists can find a way to create new cells, they may have a cure for being paralyzed.

Answer 2

I believe that it is all your cells rejuvenate every 7 months. the old ones are replaced with fresh new ones. but medical school was over 20 years ago. but I do remember learning about it,

Answer 3

Some cells are replaced very often: red blood cells, lining of intestine, and so on. Other cells are yours for life. Your nerve cells are as old as you are.