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The family of AC/DC guitarist Malcolm Young is now opening up about the rocker's health.  They say in a statement to People that Malcolm is "suffering from dementia," and add that they appreciate people "respecting their privacy." 

The band publicly acknowledged months ago that Malcolm was ill, but was never willing to divulge any details on his condition. 

Last week AC/DC announced its founding guitarist, who didn't play on their upcoming album, had left the group permanently.  The band enlisted Malcolm's nephew, Stevie Young, to play on their new release. 

Rock Or Bust is due December 2nd.  Stevie will also join AC/DC for their tour next year in support of the album.

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