This document summarizes physical development in boys and girls from ages 8 to 14. It describes changes in height, weight, and appearance during puberty for both sexes. Key physical changes for boys include deepening of the voice, growth of facial and body hair, and maturation of reproductive organs. For girls, important developments are breast growth, hip rounding, onset of menstruation, and growth of underarm and pubic hair. Height and weight charts are also provided for comparison across age groups.