Aged individuals of either sex may have less total body water because of their:

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As people age, their muscle mass tends to decrease, which results in a lower total body water content. This decrease in muscle mass is often referred to as sarcopenia, which diminishes fluid compartments in the body and increases the likelihood of dehydration. While kidney function and percentage of body fat may also change with age, decreased muscle mass is the most significant contributing factor to lower total body water.

Aged Individuals of Either Sex May Have Less Total Body