Sixteen-year-old boys should weigh an average of 134 pounds. Girls in the same age bracket weigh an average of 118 pounds. Boys who are 16 are around 68.3 inches tall, while girls are an average of 64 inches.
Milestones that may occur by a child's 16th year can include growth of the sexual organs. For girls, the hips become rounded and the breasts grow significantly. For boys, the voice deepens and the Adam's apple becomes noticeably larger. While these physical changes may be apparent when a boy or girl is 16, these growth milestones can also occur any time between the ages of 13 and 18. Sixteen-year-olds may also start to establish their own identity outside of their families and begin to think about their futures in terms of career and interpersonal relationships.