The eldery who are 70 years old should not continue working because the eldery have agile and alert reduce for work.From the survey, the eldery who are 70 years old. They are the worse health,brittel bones easily ,memery and intelligence are decreased performance and they have symptom ear tinnitus,blurry eye. So, in my openion the eldery who are 70 years old should not continue work because the eldery should take time for exercise.