No.
You forget things. Your memories get distributed and compressed. Knowledge grows stale and less detailed over time.
Your brain will never “fill” cause things you haven’t done or interfaced with in a while will be less granular, we often call this “getting rusty”.
Think of it as older less used information gets lower and lower in resolution, taking up much less space than the very high res newer or more often used stuff.
But it never really goes away totally (unless of course you have actual degenerative brain conditions of course) which is why to your dying day you have have these hazy sepia toned memories of childhood.
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