Adult BMI Categories Are Age-Independent: Same Ranges for All Adults 20+

The standard WHO BMI categories apply uniformly to all adults aged 20 and older, regardless of age:

  • Underweight: <18.5
  • Normal: 18.5–24.9
  • Overweight: 25–29.9
  • Obese: ≥30

While body composition changes with age (muscle loss, fat gain), the BMI cutoffs do not adjust. Clinicians should supplement with waist circumference, functional status, and comorbidity assessment for older adults.

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