TheUnitedStatesestimatesthataboutoneoutofevery10peop...
問題詳情： TheUnitedStatesestimatesthataboutoneoutofevery10peopleontheplanettodayisatleast60yearsold.By2050,it’sprojectedtobeoneoutof5.Thismeansthatnotonlywilltherebemoreoldpeople,buttherewillbere...