I've read that -- every six years, our bodies contain a whole new set of cells. And that -- different body parts have different cell turn over rates.

If these statements are true, then which body part is the oldest? i.e., which body part takes the longest to replace all of its cells? What's so special about that body part and its cells?

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    $\begingroup$ Have a look at this. $\endgroup$ – Charles Aug 21 '17 at 3:48

The neurons, eye lens and female gamete(oocyte) does not replace themselves.

Once formed, they will be like that as they are. They grow, but does not regenerate even when they got damaged.

Read this article

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    $\begingroup$ Some neurons do get replaced. Good answer, but best to stick to cells we know can't be replaced. $\endgroup$ – anongoodnurse Aug 21 '17 at 14:39
  • $\begingroup$ So, are you saying the brain and the eyes? My concern is not with a specific cell, but a body part in whole. kidney, lungs, heart, brain, etc. $\endgroup$ – DavidAimesJr Aug 22 '17 at 13:11
  • $\begingroup$ If you ask for a whole organ, then the answer is nothing. Because, let us take brain for example, Brain is not made up only of neurons. Brain also has glia cells (which further has 3 sub types) - Astrocytes, Oligodendrocytes, Microglia. Of these, neurons cant replace themselves but glia cells can. So the answer is there is no such organ which does not have ability to replace itself. Read this - en.wikipedia.org/wiki/Regeneration_in_humans $\endgroup$ – Kawin M Aug 22 '17 at 13:22
  • $\begingroup$ @DavidAimesJr Then relatively its heart. $\endgroup$ – JM97 Sep 3 '17 at 14:31

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