Hey @behelen! You are asking sooo interesting questions everytime :D Really creative!

The earliest memory I have - or I think I have - is from the age of 4-5 when we got our first garden in the town I grew up. The garden was introduced by my grandpa to my parents and I kind of know how this was.
When I was talking to my mom one day that I remember this she said that I was around 4 1/2 and that it was exactly as I am remembering.
But it could be that I remember stories about this happening and my brain cells formed this to real memorable images. I don't really know.. ^^

But I remember quite a lot from my early childhood and youth. I remember 50% of my classmates names from first and second class (so I was around 6-8 years old) and more from the following years.

Thanks for bringing this topic up!