Memories are funny things. Current research indicates that they’re exceptionally fallible and subject to change over time for a variety of reasons. To my way of thinking the further they deviate from actual events, the less of a “memory” they are.
Some of my earliest memories, for example, are what I’ll call indirect memories: memories of a photograph posing as a memory of the actual event.
I do have one specific memory that may qualify as one of my earliest. I say “may”, because it might have been formed when I was somewhere around 3, or 5 years old, or maybe as old as 18. I believe it to be a “real” memory because it involves some things that a photograph can’t capture: sounds and smells.