Dementia?
It's believable to have dementia in old age -- but he aged backward. In the book, he didn't start losing his memory until he was so young he'd naturally have the attention span of a -- dare I say it? -- hummingbird. They started it when he was a teen. In the book, he was a moody teenager -- as all are. Dementia didn't enter into it, because it doesn't make any sense.
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