Briefly describe the fluid changes that are associated with aging and development. Infants and Children: Older adults:

Infants and Children:

1. High Water Content: Infants have a higher percentage of water content in their bodies (about 75-78%) compared to adults. This decreases to about 65% by their first birthday.

2. Rapid Changes: Children experience rapid changes in body composition with growth and development. This includes changes in fluid balance, as they have a higher metabolic rate and turnover of water and electrolytes.

3. Kidney Function: Infants and young children have immature kidneys, which are less able to conserve water and electrolytes, making them more susceptible to dehydration.

Older Adults:

1. Decreased Total Body Water: As people age, the total body water content decreases. This is due to a decrease in muscle mass and an increase in fat content. By the age of 60, total body water is only about 45-50% of body weight.

2. Reduced Thirst Response: Older adults often have a diminished sense of thirst, which can lead to inadequate fluid intake and dehydration.

3. Kidney Function: With aging, kidney function declines. This can lead to a decreased ability to concentrate urine and conserve water, increasing the risk of dehydration.

4. Medication Effects: Older adults often take medications that can affect fluid balance, such as diuretics, which can increase the risk of dehydration.