School-age children need about 1,600 to 2,500 calories per day. Children between the ages of 5 and 6 need 41 calories per pound of body weight, and those between 7 and 11 need 32 calories per pound.
Senior citizens can use their body weight to help determine their individualized calorie needs for weight maintenance. Harvard Medical School suggests that adults need about 13 calories for each pound of their body weight if they are sedentary, 16 calories per pound if they’re moderately active and about 18 calories for each pound of their body weight if they lead an active lifestyle. For example, a moderately active senior woman weighing 115 pounds would need about 1,840 calories daily, while a moderately active senior man weighing 160 pounds requires about 2,560 calories a day to maintain his weight.
child has the largest calorie intake.