9 or 10. I can't even remember why it started. I know my mother used to say awful things to me growing up. She's always been overweight and used to get angry with me and tell me how my life would be so easy because I was thin, highschool would be great because I was thin, I would be popular etc etc. Then take me shopping and tell me I looked pregnant or comment on how I was gaining weight.
By 5th grade I had full blown Anorexia, even though I had no weight to lose. 7th grade I went through puberty and the summer after I stopped eating again and lost 20 pounds. I made it through highschool mostly okay, I'm 22 and I have it under control but I still think I'm fat and consider going back to ED on my low days.