Why are we interested in dementia?

People are living longer and our population is ageing. The worldwide population of people 65 years and over will increase by 188%, and the numbers of those aged 100 and older will increase by 1,004%. The prevalence of dementia increases with age – while 1.3% of those aged 60-64 years will have dementia, this increases to 11.6% in those aged 80-84 years and 41.5% in those aged 90 years and older.