"When you start to see the age creep up on a show like that, you wonder whether the show is sustainable, " says Laura Caraccioli-Davis, head of entertainment at Starcom, a media planning agency.

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To create an inviting space for Doug Davis, a 40-year-old entertainment and sports lawyer and the son of music mogul Clive Davis, Mr. Wolf created a plush, wraparound sofa for the living room and upholstered a wall in the bedroom with mohair to give it a cozier feel.

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Tony Dalton was speaking to BBC News arts and entertainment reporter Ellie Davis.

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