What is the oldest memory you have? . . .How far back can you remember?

I have a memory in which I was 4 years old.

A man was carrying me (towards my house) after his car's sideview mirror hit my head. My older sister (by 1 year) was yelling at him to "leave my brother alone" and trying to pull me out of his arms. LoL

When I got older I was told; it was a neighbor's car pulling out in reverse out of his driveway. We were kids playing and I ran into his mirror. Just as he began to move I was running
in his direction and his sideview mirror hit my forehead

Anyway, my upper forehead still has 1 inch scar. That was from more than 40 years ago!

How come our childhood memory is deleted

Two to three years old.

How come our childhood memory is deleted

JFK funeral
3 yrs old

I don't think it is. I think that for most children life before school is a blur of very similar days and activities. Unless there is something big like the arrival of a new sibling or a new house then memories could be from anywhere in that time frame.

I have memories from before my brother was born and after. He was born when I was three. I very vividly remember the day he was born, but I have no way to date the memories where he wasn't around.

I can remember stuff from when I was 2 1/2 or three

I was 3.

And it was early summer, just before the sun set, and it was a little chilly.

I remember it because I thought, "Will I remember this day when I get old?"

I was playing with the plastic straps of an adjustible outdoor lounge chair as I thought this, and my father was nearby grilling dinner.

Yes, little me.

I do remember it.

A year an a half. My dad was having an affair. I remember being in the grocery cart seat at the Grand Union where he met a woman in a camel colored winter jacket in the produce section. We went in her car somewhere and I was in a carrier seat of some sort placed in the center of the woman's kitchen.

It must have been so out of the ordinary that the memory stuck.