He's very athletic and is confident. 1 decade ago. Books for 10-13 year old Boys Upper Middle Grade is filled with good books for boys, yet parents are always looking for books for their boys to read. The 50th percentile for weight in this group is around 100 lb. On average, boys are taller than girls. Jawaban Simpan. But i would say 5''4 is so not short for a 13 year old boy. It's an unlucky number, so I wish you extra luck for your 13th. Update: please answer the question asked but im am about to be 13 and im 5'8 how tall do you think i will be? Answer (1 of 26): The average height of a boy 13 years old should be about 62 inches. I am a teenager boy, 13 going to be 14 and just 4 feet 9 inches tall. ! what is considered tall and what is considered short for a 13 year old black boy? I'm 13 (14 in about 3 months) and I'm only 4'10. However, the legal age to work in most states is 14, leaving 13-year-olds in a unique position. I am a 21 year old, short girl. I'll turn 15 next year already, on March. I envy those who are really tall, those who have long legs :(