I know I was 3 because that's how old I was when we lived in the house I have memories of.
I remember letting a squirrel in the house, I remember when my sister put her arm through the storm door, I remember calling our neighbor "fatso",
I remember throwing my new toy airplane down the basement stairs to see if it would fly, I remember I had a white rocking horse, I remember drawing with a red crayon between all the bricks around our fireplace, I remember my Mom taking me to see Superman and Batman serials at the local theater, I remember my bedroom was upstairs at the front of the house and I used to stand at my window and watch the big kids walk home from school, I remember when our dog ran away, I remember sitting in my Mom's sewing room listening to the radio, I remember when my father threw me across the living room into the wall, I remember him laughing when my little sister fell out of a boat at the park and I thought she was going to drown, and I remember yelling at him to stop scaring my Mom when he was chasing her around the house with a knife. Those are just some of my memories of that house - I have many, many more.
Then my Mom left my father and we moved in with her parents and lived in the basement, also when I was 3, and I remember getting chicken pox and being all wrapped up in my Grandfather's wool army blanket and how itchy it was, and I slept on the black leather couch that is now in my living room. It was there that my Mom turned me on to television and we would spend most of our days watching The Twilight Zone, The Outer Limits, Alfred Hitchcock Presents, and Star Trek. I remember I had a Mr. Spock doll with a cloth shirt, and I remember watching TV with my Grandfather - he died when I was three. His favorite shows were Perry Mason and Iron Sides and Mission Impossible. I got my first bee sting at that house, and my first wheel-barrow ride, and that's where my Mom taught me to make angels in the snow. And many, many more memories.
Like I said - very vivid memories from when I was 3.
I also remember watching the evacuation of Saigon on the news. That was 1975. I was 3.