When mine was 8, we lived in an mdu. I paid her $5 week to swep the hallways and clean the hallway windows.

What I didn't know is that she was also taking out the tenants trash bags on garbage day and they were paying her grab their trash and take it out the night before trash day. In a summer she had saved up over $500. She was 11 or 12 years old. Too much WAM (walk around money) at that age.