We'll say at least 10 years or younger.
Most Helpful Girl
When I was 17, I was walking around the neighborhood watching my younger brother playing on his bike when I saw a 9 year old kid water spraying the neighborhood kids. He was well known for being a bully, so I told him to stop, weirdo. He responded with "Everyone is weird". It made me realize how right he was. All of us can be weird sometimes.1