Mixed-Age Classroom. The multi-age classrooms offer many advantages to the children. A child can work with older children in one subject, younger children in another, and still have social interaction with children his or her own age. This is a wonderful solution to the problem of "skipping" and "holding back" children who do not fit into the traditional academic mold. Younger children observe older children and easily learn from them; older children reinforce the knowledge they have attained by helping younger children.