Most of the human body is water, with an average of roughly 60%. The amount of water in the body can change slightly with age, sex, and hydration levels.
While the average percentage of water in a person’s body is around 60%, the percentage can vary from roughly 45–75%.
For example, babies have a high percentage of water in their bodies, which decreases with age. Also, fatty tissue contains less water than muscle, so the percentage of water can vary with body type.
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See how the environment affects water.