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Older brain is willing, but too full.

Learning becomes more difficult as we age not because we have trouble absorbing new information, but because we fail to forget the old stuff, researchers say.

Mice whose brains were genetically modified to resemble those of adult humans showed no decrease in the ability to make the strong synaptic connections that enable learning — a surprise to neuroscientists at the Medical College of Georgia at Georgia Regents University, whose findings appear in the journal Scientific Reports.