請幫我翻譯Introduction - 社會議題

Developed coun tries, such as Taiwan, Japan and the
United States, have expe ri enced tre men dous growth in
their elderly pop u la tions. United Nations sta tis tics indi cate
that roughly one out of every ten per sons in the world is
aged 60 years or older today. This ratio is pro jected to rise
to one in five by 2050 and one in three by 2150 (United
Nations/Divi sion for Social Pol icy and Devel op ment,
2003). This shift in demo graph ics is fuel ing ris ing demand
for qual ity, home-like long-term care facil ities.