this post was submitted on 22 Feb 2026
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I don't think it's the number of cells inasmuch it's the connectedness. A baby has as many, if not more than you, and yet they're dumb. They're learning.
I think it's safer to go by when childhood amnesia disappears, and that's when the pruning process of removing unnecessary connections and adding other ones, has sufficently advanced. To the point that it slows down, and memories can stay for much longer.
That's generally around 3 to 6 years of age, or 36-72 months after birth. On average, 56 months (4.7 years).