Read MoreSince 2011, sales of adult nappies have outpaced those for infants in Japan as its population ages.Since 2011, sales of adult nappies have outpaced those for infants in Japan as its population ages.

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Read MoreSince 2011, sales of adult nappies have outpaced those for infants in Japan as its population ages.Since 2011, sales of adult nappies have outpaced those for infants in Japan as its population ages.