1. What is BMI for Older Adults?

Body Mass Index (BMI) is a measure of body fat based on height and weight. For older adults (65+ years), the normal BMI range is typically higher (23-29 kg/m²) than for younger adults (18.5-24.9 kg/m²).

2. How Does the Calculator Work?

The calculator uses the standard BMI formula:

Where:

• \( weight \) — Body weight in kilograms
• \( height \) — Height in meters

Explanation: The formula calculates body mass per unit of height squared. For older adults, the interpretation differs from standard BMI categories.

3. Importance of BMI in Older Adults

Details: In older adults, slightly higher BMI may be protective against mortality. Being underweight (BMI <23) may indicate malnutrition or sarcopenia, while obesity (BMI >29) increases risk of chronic diseases.

4. Using the Calculator

Tips: Enter weight in kilograms and height in meters. For height in centimeters, divide by 100 (e.g., 175 cm = 1.75 m). All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is the normal range higher for older adults?
A: Studies show that older adults with slightly higher BMI have better outcomes, possibly due to nutritional reserves and protection against frailty.

Q2: Should BMI be the only measure of health in older adults?
A: No. Waist circumference, muscle mass, and functional status are also important. BMI alone may not reflect body composition changes with aging.

Q3: How accurate is BMI for older adults?
A: BMI may overestimate fat in muscular individuals and underestimate fat in those with sarcopenia (muscle loss). It's a screening tool, not a diagnostic.

Q4: What if my BMI is below 23?
A: Consult a healthcare provider. Low BMI in older adults may indicate malnutrition, chronic illness, or frailty that needs evaluation.

Q5: Should older adults try to lose weight if BMI is over 29?
A: Weight loss should be medically supervised to preserve muscle mass. Focus on healthy diet and exercise rather than just weight reduction.