Misconception Repair Lab
Treating old age itself as an explanation for cognitive decline
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1. The tempting shortcut
"They're old — some forgetfulness is normal at that age."
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2. Stop and think
Before you read on: what is wrong with this reasoning? Try to answer in your own words, then reveal the explanation below.
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3. Reveal — why it fails
Age is a risk factor for dementia, not a diagnosis or an explanation on its own. Normal ageing does involve some mild slowing of processing speed and occasional word-finding difficulty, but it does not produce the sustained, multi-domain decline that interferes with managing everyday activities. Dismissing a genuine change as 'just age' risks missing a treatable cause (including, in some cases, delirium) and delays support for a genuine dementia.
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4. Reveal — the better reasoning rule
- Is this a genuine change from the person's own previous baseline, according to someone who knows them well?
- Does the decline affect more than memory alone, and does it interfere with everyday independence?
- Has the onset and course actually been checked — gradual (F00), stepwise (F01), or acute (which should raise concern for F05)?
- Could a reversible cause (medication effect, depression, an acute medical illness) be contributing instead?
Corrective example: An 82-year-old occasionally misplaces her keys and takes slightly longer to recall a name, but manages her finances, medications, and household independently, exactly as she always has. This is consistent with normal ageing, not dementia, because there is no genuine functional decline from her own baseline.
5. Try the transfer case
Apply the better rule above to a fresh case.