Gender: boy
School:
School #21B
I searched the name "Aron Ajdelman" and found one result containing that name under the Lodz ghetto database. I researched the full first and last name. From the birth year given, I cross-referenced it with the age a student would be in school #21B. Since the age matched, it was probable that Aron was a student at school #21 B. In addition I discovered the ghetto address: