Hellow guys, Welcome to my website, and you are watching 5년 뒤, 인구 20%는 65세 이상...'초고령화 사회' 진입 / YTN 사이언스. and this vIdeo is uploaded by YTN 사이언스 투데이 at 2020-09-28T01:43:12-07:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.
