How old were you when you stopped believing in Santa Claus?

or do you still believe??? anyways i can never really remember actually believing, maybe when i was like 3 or 4, But i was a smart kid. And my only brother 5 years older than me never really remember him believing, so christmas for me was seeing the presents under the tree 2 weeks before christmas, and waking up to unwrap the presents... hek i even remember going with my parents while they shopped for the gifts,And i had an arguement with a guy at the mall dressed as santa because he was trying to say he was real lol, and i was 6 then. And i have stayed up all night numerous times wating for him, looking outside listening out.