A major Japanese hygiene product maker began selling the world’s first “horizontally” recycled disposable diapers on Saturday as the country’s aging society undergoes a shift in demand from children’s diapers to those for older adults. The diapers, manufactured by Unicharm Corp., were created under “horizontal recycling,” which refers to worn things being reproduced into their original form. Retailer Aeon Kyushu Co will eventually sell them in 68 stores. According to the Mainichi Shimbun newspaper, Unicharm, based in the southwestern prefecture of Kagoshima, worked with local governments to se…