How Common is Dementia?
Elders aged above 70 are the most affected
Estimated prevalence rate among elders aged above 70:
One in every six women
One in every ten men
Source：
香港老人科醫學會 - 認識認知障礙症
http://www.dh.gov.hk/tc_chi/press/2006/061013.html (updated to 1 Jan 2017)