I have lots of memories from the age of two and a half, possibly earlier but breaking my arm at two and a half is the first memory I can date accurately, and which is surprisingly detailed.
I have known other people who have no memories of their life before starting school, which used to surprise me, as my own pre-school memories could fill the first volume of my yet-to-be/never-to-be written life story.
My dad wrote down his life history in his seventies, and since his death this September, age 84, I have read it (in floods of tears at times). His many memories dating from early childhood are fascinating, not just as part of our family history, but as a part of social history. A blend of gruelling poverty (brought about for his family by the Depression) and simple, typical childhood joys. When writing his memories, Dad wasn't expecting anyone to read them -he genuinely didn't expect anyone to be interested - but during the three years that we knew he was terminally ill, I persuaded him that his children and grandchildren would all love, at some later stage, to read about his life. I am so glad that he agreed, as we now have what to us is such a lovely record of his life, written in his own words. So, if any of you have thought of putting your memories on paper but haven't yet done it - DO IT NOW