Calorie Needs Decline with Age: Older Adults Require Fewer Calories Than Teenagers

Yes. Basal metabolic rate decreases ~1–2% per decade after 20 due to sarcopenia and reduced organ metabolic activity. Physical activity also typically declines. Teenagers, in contrast, have high energy demands for growth, puberty, and often higher activity levels.

• Teen boys (14–18): ~2,800–3,200 kcal/day
• Teen girls (14–18): ~2,200–2,400 kcal/day
• Older men (≥70): ~2,000–2,600 kcal/day (sedentary to active)
• Older women (≥70): ~1,600–2,000 kcal/day

Individual needs vary by health, body size, and activity. Nutrient density becomes more critical with lower calorie budgets.