TheUnitedStatesestimatesthataboutoneoutofevery10peop...
问题详情： TheUnitedStatesestimatesthataboutoneoutofevery10peopleontheplanettodayisatleast60yearsold.By2050,it’sprojectedtobeoneoutof5.Thismeansthatnotonlywilltherebemoreoldpeople,buttherewillbere...