The main portion of the Montessori curriculum is designed for children ages 2-6 years. However, there are Montessori materials which are designed for use by children up to the age of 12. There are a few Montessori middle and high schools. However, Dr. Montessori herself specifically designed materials only through the elementary school years. This was because she felt specially designed materials were only needed for the younger children since the older children would have the competence to learn from commonly available.