That's a hard one to answer because alot of my childhood I don't remember. I always thought the memory loss was just because I had a bad memory....but that's not the case. I don't remember because the mind does it's best to do this thing that I like to call 'self preservation'. I have forgotten to protect myself...anyway I think I showed signs years before I was Dx. When I was 15 I was put in the hospital for audio and visual hallucations. I was in full blown mania, I believe now. I was trigger by the death of a friend and of my grandpa, 2 days part. At that point it was brought up but no real Dx. I was officially Dx around 20 after my second sucide attempt.....ugh. So I believe the onset was before my teen years even hit. I was reading in one of the other post about how a doc took someone off of their med because Bipolar is 'overrated'. All I have to say about that is if you have been on meds and they have made a difference in your life and a doc tells you somethig like that....fire their butt....don't need a doc like that...and sure don't want one that will take you off cold turkey. That's asking for trouble even if you are not Bp. I think it is so important for us to keep looking for doc that we are comfortable with and remember that it is our health and life. Like me I don't see a talk therapist right now(looking for one)but when I do find one, it will not be a male because I'm not comfortable and my 'little ones' inside do not feel safe. So we shop around.