Did you know.. that children start forgetting early childhood around the age of 7 ? (rubbish source). It’s called childhood amnesia and due to synaptic pruning. The way to think of this is when you are born you start filling up RAM. Everything gets logged. Then.. it gets full up and the brain goes, “ok, what shall we dump? Nope. That birthday party. Gone..ahh, but that horrific event - gotta keep that - don’t want to repeat that I’ll pop that in the ROM”. And then Repeat. For the rest of your life… take pics. Lots of pics. (More source )