It's difficult to pin down memories to actual dates and ages. But I definitely know (from documents) that we moved out of the rather cramped flat where I first lived, when I was about four. And I have clear memories of living in that flat. Lets say, the following date from when I was about three.
I slept not in a bedroom but on a put-you-up in the living room. Shortage of space! When we moved house I was thrilled to get a room for the first time (albeit I had to share with my sister

).
Another occupant in the flats kept a motorbike of which I was mortally scared. Not of the bike driving along normally, but of the sudden noise it made when first started up. Sometimes this lad's mates used to call on him, all on motorbikes, they'd park on the gravel outside and then they'd all start up at once. If I was being pushed past in my buggy
(not "buggy"! "Push-chair"), I'd set to howling unconsolably. I can't to this day reason why...
Another noisy thing that scared me, was the toilet. High-cistern job with a chain, even when I could reach the chain I was afraid to pull it. And if an adult came along to pull it for me, I'd run screaming...
I remember first time being stung by a wasp. I was on my own, watching the flies buzzing against the window-pane (more flies in those days!) and noticed a big black-and-yellow one that seemed a bit more slow-moving and easier to catch. So I clambered up on the window-sill and tried to catch it. Cue screams galore, parents rushing, much hugging and kissing in consolation....