**Core Concept**
Nutritional assessment is a critical component of patient evaluation, and various criteria are used to assess nutritional status. Age-independent criteria refer to indicators that do not change with age, unlike age-dependent criteria, which vary with age.

**Why the Correct Answer is Right**
The correct answer is the one that does not fit with the other options as an age-independent criteria for nutritional assessment. One such criterion is mid-upper arm circumference (MUAC), which is used to assess malnutrition in various populations, including children and adults. MUAC is an age-independent measure that reflects muscle mass and is not affected by age.

**Why Each Wrong Option is Incorrect**
**Option A:**
This option is incorrect because body mass index (BMI) is an age-dependent criterion, as the normal range for BMI changes with age. BMI is calculated as weight in kilograms divided by the square of height in meters (kg/m^2), and the normal range for BMI varies between adults and children.

**Option B:**
This option is incorrect because serum albumin is an age-dependent criterion, as albumin levels decline with age in healthy individuals. Serum albumin is a marker of nutritional status, but its levels are influenced by various factors, including age, liver function, and inflammation.

**Option C:**
This option is incorrect because serum prealbumin (transthyretin) is an age-dependent criterion, as prealbumin levels decline with age in healthy individuals. Serum prealbumin is a marker of nutritional status, but its levels are influenced by various factors, including age, liver function, and inflammation.

**Clinical Pearl / High-Yield Fact**
One key point to remember is that nutritional assessment should be performed in conjunction with a thorough medical history and physical examination to identify underlying causes of malnutrition.

**Correct Answer:** D.