The type of idiopathic scoliosis that occurs between 4 and 9 years of age is called juvenile scoliosis. The time period when juvenile scoliosis occurs is characterized by a much slower growth and development of the child, and thus a much slower progression of the scoliotic curve. Juvenile scoliosis is also the rarest type of scoliosis. The fact is that boys mature skeletally later than girls, and in them juvenile scoliosis occurs a little earlier, about 5 years, while in girls it is diagnosed about 7 years.