Dementia is “a disease that anyone can develop.”
As of 2018, about one in seven people aged 65 years or over had dementia (an estimate).
Estimation as of 2018: Initial results of analysis of the data obtained in Hisayama-machi in Fukuoka Prefecture, Nakajima-machi in Ishikawa Prefecture, and Nakayama-cho in Ehime Prefecture, where an exhaustive survey was conducted at the start of “the large-scale dementia cohort study for realizing healthy aging society (research representative: Professor Ninomiya),” funded by the Research and Development Grants for Dementia of the Japan Agency for Medical Research and Development.
Masahiro Shigeta, Professor, Department of Psychiatry, Tokyo Jikei University School of Medicine, and also Chairman, Department of Psychoneurology and Memory Clinic of the Jikei University Hospital
According to a large-scale study conducted in 2012 by a research group of the Ministry of Health, Labour and Welfare in a total of about 9000 residents in 10 municipalities nationwide, the prevalence of dementia in persons aged 65 years or over was 15%. The number of elderly people with dementia nationwide was estimated to be about 4.62 million. In addition, the number of elderly people with mild cognitive impairment (MCI), which is considered to be a stage before the possible onset of dementia, was estimated to be about 4 million as of 2012.
According to a large cohort study of 10 000 people in eight regions nationwide conducted in 2018, about one in seven elderly people had dementia. It is estimated that the number of subjects with dementia will increase to 6.75-7.3 million by the year 2025, which translates to roughly one in five elderly people having dementia by that time.