If you replace all of your cells one by one, are you still the same person?

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Childhood amnesia kicks in around age 7

You could travel the world with an infant aged under 3 and it’s almost guaranteed that when they get older they won’t remember a single boat trip, plane ride or sunset. This is a phenomenon known as childhood or infantile amnesia, that means most of us lose all our earliest autobiographical memories. It’s a psychological conundrum because when they are 3 or younger, kids are able to discuss autobiographical events from their past. So it’s not that memories from before age 3 never existed, it’s that they are subsequently forgotten. […]

Bauer and Larkina uncovered a paradox - at ages 5 to 7, the children remembered over 60 per cent of the events they’d chatted about at age 3. […] In contrast, children aged 8 and 9 recalled fewer than 40 per cent of the events they’d discussed at age 3, but those memories they did recall were more adult-like in their content.

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