I really struggle to remember anything concrete up until I was about 18.
Everything after 18 is there and I have no memory issues now but anything from my childhood is hazy at best (except for the bullying in high-school, I remember that quite clearly!).
Is anyone else the same? It baffles me when my 57 year old colleague can remember going to a friends party when they were 6 and can even remember the dress they wore!