Memory loss: What's normal? What's not?

We collect memories well into adulthood, but at some point, we start to lose them. How to tell the difference between memory lapse and signs of a disorder. It is one of those jokes neurologists regularly share when the subject turns to patients complaining of memory lapses: When you can't remember where you left your glasses, there's probably no need to worry. When you can't remember you wear glasses you're probably in trouble.

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