Anchorage Montessori School was founded in 1977 and began its affiliation with the American Montessori School in 1978. Our School currently offers classes to children from 19 months through 12 years of age.. Toddler (19 months - 3 years) a.m. & p.m. classes. Pre-Primary (3 - 6 years) a.m. & p.m. classes and full day classes. Pre-Primary Extended Day (5 - 6 years) half day. Lower Elementary ( 6 -9 years) attend for a full day. Upper Elementary (9 - 12 years) attend for a full day.