On average, the cells in your body are replaced every 7 to 10 years. But those numbers hide a huge variability in lifespan across the different organs of the body.


Neutrophil cells (a type of white blood cell) might only last two days, while the cells in the middle of your eye lenses will last your entire life.

And it’s even possible that your brain cells might have longer maximum lifespans than you do. In 2013, researchers transplanted neurons from old mice into the brains of longer-lived rats and found that the cells were still healthy after living for two whole mouse lifespans!

What cells in the human body live the longest?
© Raja Lockey

Brain cells: 200+ years?

Eye lens cells: Lifetime

Egg cells: 50 years

Heart muscle cells: 40 years

Intestinal cells (excluding lining): 15.9 years

Skeletal muscle cells: 15.1 years

Fat cells: 8 years

Hematopoietic stem cells: 5 years

Liver cells: 10-16 months

Pancreas cells: 1 year

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