Kusan kashi 10% na al'ummar duniya, wato kusan mutane miliyan 650, suna da nakasa.Nazarin ya nuna cewa, daga cikin waɗannan, wasu 10% na buƙatar keken guragu.Dangane da hasashen yawan jama'a na duniya 2019 (Majalisar Dinkin Duniya, 2019), nan da shekarar 2050, 1 cikin mutane 6 a duniya, zai haura shekaru 65, sama da 1 cikin...
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