Aside from that, your neurons are as old as you are and will last you for the rest of your life. New neurons are made in just two parts of the brain-the hippocampus, involved in memory and navigation, and the olfactory bulb, involved in smell (and even then only until 18 months of age). All across your organs, cells are being produced and destroyed. Your liver’s cells will live for around 10 to 17 months old before being replaced. Your oldest red blood cells are around four months old. The cells on the topmost layer of your skin are around two weeks old, and soon to die. Most of your body is younger than you are.
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