相關eightyearsagoonly4ou的文學知識

問題詳情：Americaisgrowingolder.Fifty-eightyearsago,only4outofevery100peopleintheUnitedStateswere65orolder.Today,10outofevery100Americansareover65.TheagingofthepopulationwillaffectAmericansocietyinmanyw...