By age 18, boys are taller and heavier by roughly how much?

By age 18, boys are taller and heavier by roughly how much?

• A. 2 inches taller and 40 pounds heavier
• B. 4 inches taller and 20 pounds heavier
• C. 6 inches taller and 40 pounds heavier
• D. No difference

Answer: (B)

During adolescence, boys’ growth spurts extend longer and lead to more muscle mass, driven by testosterone, while girls’ growth ends earlier. By the end of high school, the typical pattern is that boys are about 4 inches taller and about 20 pounds heavier on average than girls. This reflects overall differences in timing and amount of growth, not a universal rule for every individual. Therefore, the choice indicating a 4-inch height difference and a 20-pound weight difference best fits the common developmental pattern.

During adolescence, boys’ growth spurts extend longer and lead to more muscle mass, driven by testosterone, while girls’ growth ends earlier. By the end of high school, the typical pattern is that boys are about 4 inches taller and about 20 pounds heavier on average than girls. This reflects overall differences in timing and amount of growth, not a universal rule for every individual. Therefore, the choice indicating a 4-inch height difference and a 20-pound weight difference best fits the common developmental pattern.