I guess mine would have to be when I was about 7-8, I remember feeling really down all the time but that could be due to the family situation I was in at that time. I also remember having what I now know are delusions, around 10 years old. I had a teacher pull me out of class once when I was 14 and she straight up asked me if I was bipolar due to how erratic my moods where. I had also threw a textbook at a boys head that day because he wouldn't leave me alone and had constantly picked on me. I officially got diagnosed with bipolar with psychotic features at the age of 17.