Answer:
Around 68 inches tall.
Step-by-step explanation:
A 16 year old boy, on average, is around 68 inches tall (5'8″) and weighs 134 pounds.
Once a boy reaches adulthood at 18 and above, he will be, on average, between 69 and 70 inches tall (5'9″ and 5'10”) and weigh somewhere between 148 and 160 pounds.