Is it normal if 14 years old boy is 178cm tall?

The average height for a 14-year-old boy is around 5 feet 6 inches (168 cm). However, there is a wide range of normal heights for boys of this age, and some boys may be taller or shorter than average. Generally speaking, if a boy is within two inches of the average height for his age, he is considered to be within the normal range. Therefore, a 14-year-old boy who is 178 cm tall is considered to be within the normal range.