It’s not as though one cell stores one fact. We don’t completely understand how either memory or neuroanatomy work, but we know it’s not that simple. No one has ever run out of “room” for new information, so there’s no reason to believe in a hard limit. It’s likely that other factors prevent us from learning and remembering everything.
The current understanding is that you never lose memories, but you do lose the ability to access some memories, or to put it another way, you only retain the ability to access some of what you’ve experienced.
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