I found out when I was 8. Maybe 9 but I think 8. I just knew there was no Santa, and I confronted my mom about it, who was honest with me. I then spilled the beans to my best friend and unintentionally ruined her whole day. I was literally like "Guess what? There's no such thing as Santa." I was shocked that she still believed. She was kind of an alpha mean girl and I felt she was better than me at so much. Not at this though.