The ruling on a seven-year-old student praying in the row behind the teachers

Question:
He says: Honorable Shaykh, what is your view on a student who has not yet passed the age of six or seven praying in the row behind the teachers in the midday prayer at the school?

Answer:
If the student is seven years old, it is permissible for him to pray in the row behind them, because his prayer is valid; it counts as a voluntary prayer for him. Is his prayer in the row valid? This is based on the statement of Anas: "I stood up..." . The term "orphan" is not applied except to a young child who has not reached puberty, and he and Anas stood behind the Messenger (peace and blessings be upon him).