What is the average height for a 14-year-old? The average height of 14-year-old boys A 14-year-old boy's average height is 64.5 inches. He can also expect to gain 5 inches by the time he turns 20. Bad news is that some boys stop growing between 13 and 15. Parents and children need to be aware of the average height for their age. They can then determine if they are on the right track to reaching their full height potential. The average height of 14-year-old females The growth of females is fast during childhood. It accelerates when they reach puberty, which occurs at around 8. At 14 years old, or just a few years after their first period, they reach adult height. A 14-year-old girl's average height is 62.5 inches. See more at https://deliventura.com/what-is-the-average-height-for-14-year-old-children/