I was diagnosed with ptsd when I was younger, and at the time couldn't understand the diagnosis because I felt totally fine, and extremely mature, too mature for a kid. I thought I was smarter than everyone around me, and very cold heartedly devoted to honor and not feeding into stupid things like I saw everyone around me doing. I thought I was the only reasonable person in the world and everyone else was so stupid.
For me it was gradual, I realize now that I was very cold and numb at that time and experiencing a lot of anger and pain that I had yet to unleash, it was the only way I could deal with the situation. Looking back on it now, I realize that I did and thought odd things that other kids didn't, even though I felt "normal" and numb. The full effect did not happen, and I did not realize what I was experiencing until I had to live on my own and was away from my family and friends. Then the panic attacks set in, flashbacks, everything else. I remembered all kinds of things. Before I had only thought that I was just weird or something, it was like I was in a weird daze for so long, almost like starting out old, then becoming more and more a child as I got physically older. I now often feel like a scared child, while as an actual child, I felt like a cunning older woman, or rather a sex-less cunning alien person or something. So to sum it up--- the period of abuse and neglect happened from when I was a toddler to when I was about 21. I was numb or "old feeling" from as far back as I can remember, until about the age of 17. From 17 and on was when I finally began feeling like a helpless child and starting to see the beginning of my symptoms like flashbacks, etc.