I always had all the memories from when I was 8. The only thing that puzzled me was that from the first instance, I hadn't been shocked, just angry that I'd been tried into a particular room with a lie, but hadn't thought any more about it.
When I was about 45 ish, dd, then about 5, tried to stop me talking by placing a hot sweaty mit across my mouth, and it partly blocked my nose. She'd already done this a few times, and I'd told her I didn't like it, and said not to do it. Anyway, this one time, I suddenly saw pictures, of scenes from the past, and the shock was so great, I nearly pushed her out of bed - she'd come into our bed early one morning. The memory was weird, in that it was only in pictures and feelings, so that all I can assume is that this early incident was from before I could talk.
Over the next few days, this gradually developed, with other pictures surfacing to give a more complete history. In this abuse, someone had placed a sweaty hand over my mouth to stop me crying for help, and had partly obscured my nose. It was this that caused the memory to surface. The additional images and feelings came back spontaneously, without any hypnosis or anything like that.
I hope that helps, was wondering why you are asking. Do you think that you may have been abused, and have suppressed it?
If that is the case, there may be a few signs, such as avoiding a particular place, person, or certain things, perhaps even smells. Weird, even now, I get very uncomfortable if I'm in a room, and someone is between me and the window, blocking the light.