Imagine being able to remember every single day of your life, all the way back to when you were a newborn.
Australian woman Rebecca Sharrock is one of only 60 people in the world with a highly superior autobiographical memory (HSAM), also known as hyperthymesia.
Your brain seems to actively forget almost everything before age ~4 and most things before age ~7. The phenomenon is known as childhood or infantile amnesia. It’s possible to retain memories from those ages just very unlikely. I think trauma and strong emotions make them more likely to be retained.
There are several theories why but we don’t really know. It’s possible these people have that shut off.
Honestly I wonder how many GB (or whatever the equivalent is for neural networks) the average person’s long term memories take up.