Mixed-age classrooms are educational settings where children of different ages and developmental stages learn together in the same space. Instead of grouping children strictly by their age, mixed-age classrooms allow for a broader range of skills, interests, and abilities to interact. This model has long roots in education, historically seen in one- room schoolhouses where children of all ages learned together. It is still widely used in certain educational philosophies like Montessori and Waldorf, but over time, many mainstream educational systems have shifted towards age-segregated classrooms.