Does the human body replace itself every 7 years?

There are trillions of cells in your body, but the cells that you have today are not all the exact same cells that you had yesterday. Over time, cells age and become damaged, so your body’s cells are constantly replicating, creating their own replacements. 

This constant cellular activity has sparked a popular idea (opens in new tab): Every seven years or so, your cells have been so productive that your body has replaced every part of itself — from your eyelashes to your esophagus. In other words, after about seven years of cellular replication, you’re an entirely new collection of cells, inside and out. 


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