I have lots of childhood memories starting from 3 or 4 years old. My sister however, hardly remembers anything - she can’t even remember our parents taking us to DisneyWorld in Orlando (twice - she was roughly 8 and 10 I think on those trips).
Some examples of things I can remember:
looking out of my bedroom window at the house we lived in before we moved when I was 5 and seeing my neighbour in her garden
Cutting my eye open at nursery within a few days of my 4th birthday
My favourite story book that every night at the old house I would wait til my mum went downstairs then I would turn on my light to read it.
Flooding my parents house because the water was off before I went for a nap
Watching the All Blacks on tv when I got home from nursery at lunchtime
Watching Knight Rider on a Friday night
A power cut that I thought meant I would miss Knght Rider… but it came back on just in time
My parents making a rocket ship and a boat for me and my sister out of cardboard boxes from appliances at our old house.
Making these pink and green peppermint sweets with my mum.
The exact layout of our house from before we moved including the garden.
Watching my dad go to work from the front room window and waving to him.
Playing with Sticklebricks and a Transformer.
These were all from under 5 - so many above that age I couldn’t list them all! As I’m starting to think, there are more memories flooding back even from that young age.