I don't think I had much concept of gender at four. I was the little one in the family and My mum used to call me daisy. I think, looking back, that my parents raised me in a fairly gender nuetral way. I loved a lot of boyish things like Lego and visiting castles but I also loved nature and was very quiet and shy. I could spend hours just with my own imagination, or usually just drawing. My earliest memory was going to a farm to buy a cat, which my parents said was when I was around two. But it's just vague pictures, nothing concrete, and I have no idea how much my brain has made up to fill in that scene.
I didn't really realise something was badly wrong until around 10/11 when I felt society outside of my family started demanding I act a certain way. I was extremely emotionally sensitive (still am) and I remember high school being a real shock.
When people tell me they knew since four, I never know how to react. Part of me thinks that it's way too young to have any clear certainty about gender, but then I think just because its outside of my experience it doesn't mean it can't happen. I've heard it used as a bit of a badge of honour in the past and before I decided to transition it made me feel a bit like I couldn't really be transgender because my life didn't fit the narrative that everyone else spoke of. Nowadays I feel a bit less sensitive about it because I know this is right for me, but I do think we have to be careful not to put too much weight on when we first knew.